Ah, conspiracy theories. The stuff of legend and lore packed together with bits of facts and pieces of truth. Turns out, there are a lot of outlandish theories that people believe to be true.
This video explores some of the most notorious conspiracy theories in US history, and it's interesting to see which ideas have convinced the most people.
And when you really dive deep into the sources and material behind these conspiracies, you may find yourself starting to believe, starting to doubt everything you know.
Just as quickly as you start to tell your friends, they'll start trying to tell you you're wrong. That's the inglorious beauty — and for some, hair-pulling frustration — of a conspiracy theory. Does this video cover the most believable conspiracy theories?