30 Historical Hoaxes That Fooled Scientists, Governments, and the Press
Throughout history, elaborate deceptions have fooled not just ordinary people but some of the world’s most educated and skeptical experts, including scientists, government officials, and journalists. These hoaxes succeeded not through outright stupidity on the part of those deceived but through cleverly exploiting existing biases, desires to believe, and the gap between what people wanted to find and what rigorous evidence actually showed.
The most successful hoaxes in history reveal uncomfortable truths about human nature: that educated people see what they want to see, that confirmation bias affects everyone regardless of expertise, and that the desire for a good story often overwhelms commitment to careful fact-checking.
Piltdown Man
Amateur archaeologist Charles Dawson claimed to have discovered the “missing link” between apes and humans in a gravel pit near Piltdown, England, in 1912, presenting what he claimed was a large-brained skull with an ape-like jaw. The scientific community embraced Piltdown Man enthusiastically because it fit their expectations for what human evolution should look like.
The fraud persisted for over 40 years until 1953 when fluorine dating revealed that the specimen consisted of a human skull paired with an orangutan jaw and chimpanzee teeth. Piltdown Man shaped theories of human evolution for decades and caused genuine scientific harm by leading researchers away from authentic fossil discoveries in Africa.
War of the Worlds Broadcast
On October 30, 1938, Orson Welles directed a radio adaptation of H.G. Wells’s science fiction novel formatted as breaking news bulletins describing a Martian invasion of New Jersey. Many listeners who tuned in late missed the introduction identifying it as fiction and believed the broadcast represented actual news.
Police departments received panicked calls from people asking for protection or verification of the invasion. While the panic was less severe than later mythology suggested, the broadcast demonstrated how media could manipulate public emotion and create mass hysteria through seemingly credible presentation of false information.
The Cottingley Fairies
Two young girls from England, Elsie Wright and Frances Griffiths, created a hoax in 1917 by photographing paper cutouts posed as fairies, fooling even Arthur Conan Doyle, creator of Sherlock Holmes. The famous fairy photographs convinced Doyle and other prominent figures that fairies were real, and the hoax wasn’t definitively exposed until many years later.
The girls’ ability to fool educated adults who should have known better highlighted how desire to believe can overcome critical thinking even in people trained in observation and deduction.
The Great Moon Hoax of 1835
The New York Sun published a series of articles claiming that astronomers had discovered life on the moon, including winged humanoids and sophisticated civilizations. The “moon hoax” was entirely fabricated but was eagerly believed by the public and even some scientists who wanted to credit the newspaper with a genuine scientific discovery.
The hoax demonstrated how new print media could spread misinformation to mass audiences and how desire for scientific discovery could override skepticism.
The Cardiff Giant
A farmer in Cardiff, New York, plowed up what appeared to be a 10-foot-tall stone statue of a man in 1869, creating a sensation that attracted enormous crowds who paid money to view the “petrified giant.” Museums and scientists debated the statue’s authenticity and significance until it was revealed to be a hoax created by cig manufacturer George Hull, who had commissioned the stone statue as an elaborate prank.
The Cardiff Giant demonstrated how visual “evidence” could fool even skeptical observers and how expensive the hoax could become as believers invested in confirming it.
Hitler’s Diaries
In 1983, the German magazine Stern published what it claimed were Adolf Hitler’s personal diaries, generating enormous media attention and scientific interest. Experts initially believed the diaries were authentic before analysis revealed they were forgeries.
The hoax fooled leading historians and editors because the diaries seemed to provide genuine insights into Hitler’s mind and matched expectations about how his personal writings should read. The incident highlighted how expertise could be fooled by materials that confirmed what experts already believed.
The Roswell Autopsy Footage
Footage allegedly showing the autopsy of an alien being recovered from the 1947 Roswell UFO crash site circulated for years before being proven false. Government officials and UFO believers invested enormous effort in analyzing the footage despite the absence of verifiable provenance.
The hoax demonstrated how compelling visual evidence could override skepticism even about extraordinary claims requiring extraordinary proof.
The 1967 British Flying Saucer Hoax
Two 21-year-old apprentices created hoax UFO “spacecraft” as a prank for RAE Apprentices’ Rag Week, placing the objects along a line across Southern England on September 4, 1967. Police and military authorities responded immediately, with some craft sent to weapons establishment facilities for analysis.
The hoax received extensive media attention before being revealed the same day it was discovered, demonstrating how official institutions treat extraordinary claims even with minimal evidence.
Bathybius Haeckelii
Noted scientist Thomas Huxley believed he had discovered a primitive living substance called Bathybius Haeckelii in deep ocean samples, which he thought represented primordial life matter. The “discovery” influenced theories of evolution until 1875 when chemist John Young Buchanan proved that Bathybius was merely a chemical precipitate formed when preservative alcohol reacted with calcium sulfate in the mud.
Huxley quickly and publicly acknowledged the error, setting a model for scientific integrity that remains relevant today.
The Great French War Hoax of 1814
A colonel named Du Bourg arrived in Dover, England, in February 1814 with news that Napoleon had been killed and that Allied victory was inevitable. The news spread to London, causing the stock market to boom.
Three investors who had purchased thousands of pounds in stocks just before the announcement profited enormously before the hoax was revealed. The incident illustrated how false news could be weaponized for financial gain and how even government markets could be manipulated by misinformation.
The Ghost Photographs of William H. Mumler
In the 1860s, photographer William H. Mumler created fake photographs showing ghostly images of deceased persons standing next to living relatives, claiming these “spirit photographs” provided proof of life after death. Mumler convinced many grieving families that he had captured evidence of their dead loved ones, charging substantial fees for the photographs.
Even after being exposed as a hoaxer, Mumler’s work influenced spiritualist movements and photography criticism for decades.
The World Will End Hoax of 1940
Radio station KYW announced on March 31, 1940 that astronomers from Franklin Institute had predicted the world would end at 3 p.m. on April 1, causing genuine panic before the April Fools’ prank was revealed. The hoax demonstrated how easily radio broadcasts could spread false apocalyptic claims and how even prediction of catastrophe could be weaponized as entertainment.
The 1967 Swiss Moon Landing Hoax
Two years before the actual Apollo moon landing in 1969, Swiss radio announcers broadcast an elaborate hoax claiming that humans had successfully landed on the moon, complete with fake interviews and detailed descriptions of the landing. Listeners believed the news for several hours before it was revealed as an April Fools’ prank, demonstrating how compelling realistic presentation could fool audiences even about extraordinary claims.
The Richard Branson UFO Hoax
In 1989, British police received calls about a UFO sighting when a hot air balloon shaped like a UFO landed in a field outside London. When police arrived, they encountered a silver-clad figure emerging from the craft.
The “spacecraft” was actually a promotional stunt orchestrated by Richard Branson that had been intended for Hyde Park but landed in Surrey when wind patterns changed. The incident demonstrated how even official law enforcement could be fooled by unexpected visual evidence.
The George Adamski UFO Claims
George Adamski claimed to be a professor who had contacted benevolent space beings and received messages about nuclear weapons dangers. He cited non-existent scientists who supposedly verified his claims, using false authority to increase credibility.
Adamski’s contactee stories influenced UFO belief communities for decades despite being completely fabricated.
The Loch Ness Monster “Surgeon’s Photograph”
The famous 1934 photograph purporting to show the “Surgeon’s Photograph” of the Loch Ness Monster was revealed decades later to be a hoax created using a toy submarine fitted with a carved monster head. The hoax fooled paleontologists, wildlife experts, and the general public for decades because it provided visual “evidence” of something people desperately wanted to believe existed.
The Abraham Lincoln Ghost Photograph
A photographer claimed to have captured the ghost of Abraham Lincoln appearing next to a portrait of the deceased president in a photograph taken months after his assassination. The image fooled many Americans who wanted to believe that Lincoln’s spirit had been captured, even though photographic techniques of the era made such double exposure effects relatively simple to create.
The McMinnville UFO Photographs
In 1950, a farmer in McMinnville, Oregon, claimed to have photographed a flying saucer hovering over his property. The photographs became some of the most famous UFO evidence, circulating for decades before analysis suggested they were likely hoaxes involving a small object photographed at close range.
The images demonstrated how perspective could fool analysis of scale and distance.
The Jersey Devil Sightings
In 1909, multiple residents of New Jersey claimed to have seen a mysterious creature, sparking a month-long panic that drew police, militia, and newspapers. Though some sightings were later attributed to pranks and misidentification, the “Jersey Devil” became one of America’s most famous cryptids based entirely on eyewitness accounts with no physical evidence.
The Area 51 Autopsy Footage
“Authentic” footage of alien autopsies supposedly filmed at Area 51 military base circulated in the 1990s, influencing UFO belief communities despite being proven false. The footage exploited government secrecy and public fascination with extraterrestrial life to gain credibility despite lacking verifiable provenance.
The Lake Champlain Monster (“Champ”)
Similar to the Loch Ness Monster, supposed photographs and eyewitness accounts of a lake monster in Lake Champlain between New York and Vermont have persisted for decades without physical evidence. The hoax demonstrates how cryptid mythology can spread through communities seeking unique identity and mystery.
The Bigfoot Suit Confession
An actor admitted in deathbed interviews that he had worn a Bigfoot suit in famous footage taken in 1967, explaining the origins of some of the most compelling cryptid evidence. However, some Bigfoot believers refused to accept the confession, continuing to believe the footage showed an actual creature.
The Dowsing Stick Deception
Water dowsers claimed they could locate underground water sources using special sticks or rods, a practice that fooled investors and government officials despite lacking scientific basis. Controlled tests repeatedly demonstrated that dowsing performed no better than random chance.
The Perpetual Motion Machine Hoax
Throughout history, inventors have repeatedly claimed to have created perpetual motion machines, machines that produce more energy than they consume. Though thermodynamics has definitively proven perpetual motion machines impossible, hoaxers have fooled investors, patent offices, and even some scientists with supposedly working models.
The Flat Earth Conspiracy
Despite overwhelming scientific evidence and centuries of observation, flat earth conspiracy theories persist, with believers claiming NASA and world governments have hidden evidence of a flat planet. Modern flat earth hoaxes exploit distrust of government and institutions to spread scientifically false claims.
The Ancient Astronaut Theory Hoax
Various authors and documentarians have promoted the hoax that ancient aliens visited Earth and influenced human civilization, creating structures and technologies impossible for ancient humans. The theory exploits desire to believe in extraterrestrial contact and failure to credit ancient human ingenuity.
The Lunar City Discovery Hoax
Various hoaxers have claimed to have discovered artificial structures or cities on the moon, using photographs and analyzing NASA imagery to “prove” the existence of alien bases. NASA and astronomers have repeatedly explained these as natural lunar features, but the hoaxes persist.
The Tunguska Explosion UFO Theory
The 1908 explosion in Siberia was claimed by some to have been caused by an alien spacecraft, despite scientific evidence pointing to a meteorite impact. The hoax demonstrates how mystery can spawn multiple competing explanations and how aliens are often blamed for natural phenomena.
The Conspiracy to Hide the Cure for Cancer
Various hoaxers have claimed that government agencies and pharmaceutical companies have hidden effective cancer cures to maintain profits. These hoaxes exploit justified skepticism about corporations and real healthcare failures to spread dangerous medical misinformation.
The Roswell Alien Autopsy Hoax (Post-1995 Versions)
Multiple versions of supposed alien autopsy footage emerged in the 1990s and 2000s, each claimed to be authentic documentation of extraterrestrial beings. Despite repetitive exposure of these hoaxes, new versions continue to circulate and fool believers.
Why Hoaxes Persist Despite Exposure
The most interesting aspect of historical hoaxes is that many persist even after being definitively disproven, with believers continuing to trust the hoax over expert debunking. This pattern reveals something fundamental about human psychology: we believe what fits our existing worldview and desire to believe is often more powerful than evidence against our beliefs.
Each successfully exposed hoax should make people more skeptical and careful about evaluating evidence, yet instead new hoaxes emerge, sometimes more elaborate than previous ones. The history of hoaxes is ultimately a history of human cognition and the seemingly universal tendency to see what we want to see rather than what evidence actually demonstrates.
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