15 Most Expensive Typos Ever Made in History
Everyone makes typos. Maybe someone types “your” instead of “you’re” in an important email, or autocorrect changes a word into something embarrassing.
Most of the time, these little mistakes just make people laugh or feel a bit awkward for a moment. But some typos have cost millions or even billions of dollars, destroyed rockets, crashed stock markets, and changed the course of history.
Get ready to see how a single missing letter or misplaced number can turn into the most expensive mistake ever made.
NASA Mariner 1 hyphen disaster
On July 22, 1962, NASA’s Mariner 1 spacecraft was supposed to fly to Venus and become America’s first successful interplanetary mission, but a missing hyphen in the computer code made the rocket go haywire just minutes after launch.
The guidance system couldn’t understand the programming without that tiny punctuation mark, so the rocket started flying in the wrong direction. NASA had to blow up their own spacecraft before it crashed into a shipping lane or populated area.
Arthur C. Clarke called it “the most expensive hyphen in history,” and he wasn’t joking – the disaster cost NASA $18.5 million, which equals about $192 million today.
The Wicked Bible printing catastrophe
In 1631, London printers Robert Barker and Martin Lucas made history’s most scandalous typo when they left out the word “not” from the seventh commandment, making it read “Thou shalt commit adultery” instead of “Thou shalt not commit adultery”.
King Charles I was furious and ordered all 1,000 copies destroyed immediately. The printers were fined £300, which was an enormous sum back then, and they lost their printing licenses.
Only about eleven copies survived the royal book burning, and today each one is worth hundreds of thousands of dollars. The mistake earned this edition the nickname “The Wicked Bible,” and it’s still making headlines almost 400 years later.
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Mizuho Securities trading nightmare
A trader at Japan’s Mizuho Securities Company in 2005 meant to sell one share for 610,000 yen but accidentally typed an order to sell 610,000 shares for one yen each.
The computer system processed this obviously crazy order before anyone could stop it. Other traders immediately jumped on the bargain and bought up all the cheap shares.
The bank lost its entire profit for that year and had to ask other financial institutions for help. The single keystroke error cost the company millions and became one of the most famous trading disasters in Japanese history.
Chilean peso spelling mistake
Chile’s government printed 50 million coins with their country’s name spelled wrong, turning “Chile” into “Chiie” with an extra letter that nobody caught during quality control.
The mistake only came to light after millions of coins were already circulating in stores and banks across the country. Officials had to recall and melt down most of the misprinted coins, losing over $3 million in copper and production costs.
Some of the error coins escaped the recall and now sell to collectors for hundreds of dollars each. The whole mess became a national embarrassment that made international news.
German government bond decimal disaster
A German treasury employee was entering interest rates for a government bond auction when she accidentally typed 25% instead of 2.5%.
International banks saw German bonds offering incredibly high returns and started buying billions of euros worth before anyone noticed the mistake. The German government had to honor all the sales at the wrong interest rate because the transactions had already gone through.
The decimal point error cost Germany over 50 million euros and made their finance ministry implement new double-checking procedures. The worker kept her job but probably never made another decimal mistake again.
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London Stock Exchange computer chaos
A software bug at the London Stock Exchange made stock prices appear 100 times higher than they actually were, turning penny stocks into expensive shares overnight.
Traders saw their computer screens showing impossible numbers and started panicking about what was happening to the market. Some people tried to buy everything they could while others sold their holdings in fear.
The exchange had to shut down trading for several hours while technicians fixed the system and sorted out the mess. Millions of pounds were lost in the confusion, and the exchange spent even more money upgrading their computer systems.
Swiss bank transfer blunder
A Swiss bank employee was supposed to transfer 100,000 francs between accounts, a routine transaction that happens thousands of times every day.
Instead, she accidentally added an extra zero and sent 10 million francs to the wrong account. Getting the money back required weeks of international paperwork, lawyers, and phone calls between banks in different countries.
Exchange rates moved while the money was stuck in legal limbo, costing the bank millions more in losses. The incident showed how one tiny typing error could create a diplomatic and financial crisis between multiple nations.
Florida lottery system malfunction
Florida’s lottery computer system had a glitch that printed consecutive winning numbers on thousands of tickets instead of the random numbers that were supposed to appear.
Hundreds of people showed up at lottery offices expecting to collect millions of dollars in prize money. The state couldn’t just tell everyone to go home empty-handed without facing massive lawsuits from angry ticket holders.
Officials ended up paying over $19 million to people who technically shouldn’t have won anything. The lottery had to completely replace their computer systems and hire security experts to prevent future glitches.
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Tokyo Stock Exchange New Year crash
The Tokyo Stock Exchange decided to update their trading software on New Year’s Day 2005, which seemed like a quiet time to make technical changes.
The update completely crashed the entire system and prevented any trading from happening for the whole day. Companies that planned to go public had to postpone their stock offerings while international investors lost confidence in Japanese markets.
The crash cost the Japanese economy billions of yen in lost transactions and damaged Tokyo’s reputation as a reliable financial center. The exchange spent months rebuilding their system and their credibility with global investors.
NASA Mars Climate Orbiter measurement mix-up
NASA spent $327 million building the Mars Climate Orbiter to study weather patterns on the red planet, but the spacecraft burned up in Mars’ atmosphere because of a units conversion error.
One team programmed the navigation system using metric measurements while another team used imperial measurements like feet and inches. The spacecraft flew too close to Mars and was destroyed by atmospheric friction before it could begin its mission.
Engineers only discovered the mistake after losing contact with their expensive robot forever. NASA now requires all teams to use the same measurement system to prevent similar disasters.
Bank of America interest calculation error
Bank of America discovered that their computer systems had been calculating interest rates incorrectly on millions of customer accounts for over a year.
The programming error was tiny, involving just a few decimal places, but it affected so many accounts that the total impact reached hundreds of millions of dollars. Some customers had been overcharged while others paid too little on their loans and mortgages.
The bank had to hire thousands of temporary workers to manually check every affected account and issue refunds or collect additional payments. Legal fees, government fines, and settlement costs added millions more to the final bill.
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Welsh road sign translation disaster
Welsh government workers needed a bilingual road sign warning about truck restrictions, so they sent the English text to a translator for the Welsh version.
The translator wasn’t in his office and had set up an automatic email reply, but the workers didn’t realize this and printed whatever response they got. Thousands of drivers saw a road sign that said “I am not in the office at the moment. Send any work to be translated” in Welsh.
The government had to replace the sign and probably hire actual human translators instead of relying on email responses. The mistake made international news and became a symbol of translation gone wrong.
Codelco copper trading catastrophe
A trader at Chile’s state-owned copper company Codelco made a typing error that led to a trading spree costing $175 million by the end of the day.
After realizing his initial mistake, the trader tried to fix things by buying and selling more copper contracts to cover his losses. Each new trade made the situation worse as he dug himself deeper into a financial catastrophe.
Codelco fired the trader and filed a lawsuit against the brokerage firm, claiming they should have stopped the obviously problematic trading activity. The incident became one of the most expensive individual trading mistakes in commodity market history.
Scottish Parliament building cost explosion
The Scottish Parliament building project started with a budget of £40 million but ended up costing £431 million partly due to constant changes and communication errors in the planning documents.
Architects and contractors kept receiving different instructions because of mistakes in technical specifications and cost estimates. Every revision and correction added millions more to the final bill as workers had to tear down completed sections and rebuild them.
The project took years longer than planned and became a symbol of government waste and poor project management. An official inquiry found that unclear documentation and frequent changes were major factors in the cost overrun.
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Dart Group stock market typo
A single-letter typo in a company announcement caused Dart Group’s stock price to crash when investors thought the travel company was in serious financial trouble.
The press release accidentally said the company was facing “exceptional costs” instead of “exceptional growth” due to a proofreading error. Share prices dropped dramatically as investors rushed to sell their holdings before the company went bankrupt.
Trading had to be suspended while officials corrected the announcement and explained that the company was actually doing very well. The stock eventually recovered, but not before millions of dollars in market value disappeared and several investors lost their life savings.
From keyboards to catastrophes today
These expensive mistakes prove that even the smallest errors can snowball into massive disasters when they happen at the wrong time and place.
A missing hyphen destroyed a rocket, a decimal point in the wrong spot crashed stock markets, and a single letter cost investors millions of dollars. Modern technology spreads these errors faster and wider than ever before, turning tiny human mistakes into global crises that make headlines around the world.
The lesson here isn’t that people should be afraid of making mistakes, but that someone should always double-check the important stuff before hitting “send” or “print.”
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