Blockbuster not buying Netflix.
Two terrible decisions for the price of one:
The British gave Native American’s blankets diseased with smallpox to “thin” out their ranks during The French and Indian War. They didn’t anticipate just how deadly this would be; some tribes losing as much as 90% of their number due to the epidemic.
When Edward Jenner invented the smallpox vaccine, Britain made fast allies by exporting it out to the world. Some of those shipments were to be sent to the United States, with the intention of helping both the Colonial American populace and the Native American Populace.
Only problem was that the Colonials and the Natives were having a bit of a war for the west at the time. The US Army took the vaccines hostage, with the intention of letting more Natives die, until they gave up and moved into the reservations the US Army had built for them.
Native Americans just can’t catch a break at all.
Radcliff Line – The process to divide India and Pakistan boundary in 1947 was done hastily and without major considerations to local populace religion. Radcliff was not a geography guy and majorly messed up the process. Millions died.
Anatoly Dyatlov making sure with every step, that reactor 4 at Chernobyl exploded in 1986.
Yahoo refused to buy Google for 1 million and later for 40 billion again.
Edit: They refused 1 million, later offered 3B, and Google wanted 5B so no deal. And Yahoo was offered 40B by Microsoft and they didn’t want to sell. And later they sold for 4.6B.
David Cameron’s decision to call a referendum on Brexit, closely followed by Teresa May caking a snap General Election and losing her party’s majority.
Robert Ballard, one of the guys who discovered Titanic, says that his biggest regret is that he and Jean-Lous Michel didn’t bring a piece of the Titanic up with him when he first discovered it in 1985. At the time, they didn’t want to disturb the wreck, and leave it pristine. But if they had done so, then they would’ve been able to claim legal ownership of the wreck under international maritime law, and therefore more control over it. Because they chose not to do that, everyone and their grandma is free to take artifacts and pieces of the wreck, and this makes preservation impossible.
The Donner Party of 90 pioneers choosing to take a shortcut when heading West from Illinois to California in 1846. Said shortcut led to them getting trapped in the Sierra Nevada mountains and resorting to cannibalism.
Maybe not the *worst*, but maybe Ronald Wayne, he was a co-founder of apple along with Steve Jobs and Steve Wozniak in 1976. Just 12 days after forming the company, he sold his shares for $800. He owned 10% of the company, which would be worth ~$80,000,000,000 (80 billion) today.
The guy that sold the bottling rights for Coca Cola, for $1, and never even made the guy pay the $1.