Can you give an example of a documentary where the person telling the story believed it to be true, but it turned out to be false?

Read also:

• Why does my dog keep licking at her privates now? She is 7 years old and has barely started licking there. The vet said she’s fine but she keeps doing that.
• Are evolutionists giving evolution a bad name by claiming humans started off as shrews?
• How did the trans issue metastasize within just a decade from being a question of kindness and tolerance to a tiny minority to convulsing a whole society?
• What is the lowest probability event you have personally witnessed?
• How do I deal with autistic burnout/meltdown/shutdown when cooking?
• Is it possible for sociopaths to feel genuine remorse for their actions or thoughts towards others, even if they are skilled at hiding it from others?
• Why can't NASA just bite the bullet and launch a plainly simple mission, audited by flat earther peers start to finish that definitively proves to even the smallest minds that the earth is an oblong spheroid, and not flat?
• Why do some young mothers trick a guy into believing that they're pregnant and it's their child when years later they find out that it's not even theirs should he still pay child support or not?
• Why do flat Earthers run away like whipped dogs with their tails between their legs when asked simple questions that expose their delusions as fantasy?
• Why do men like women gold diggers?
• How is it not psychopathic to use someone for sex, even if they agree?
• What is the craziest thing that you've ever witnessed?