I had not heard about this one!

Here's a list of conspiracy theories* that the people posting them believe** to be true:

https://primal.net/e/nevent1qqs25n2xxpg8hqe4pvmjvqe5e93tpdcqj8fel8d2wrl63sxgfygychs9luxgd

* something that school books ignore and/or wikipedia labels as a conspiracy theory.

**The person writing it gives it at least a 75 percent chance of being true.