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 do you suck men's dicks?
• I just cannot wake up early, even if I sleep on time. What should I do?
• Can you summarize season 1 of "The Acolyte"?
• My stepmother has banned me from the family. Can she legally keep me from going to my father's funeral?
• What defines the k'vanna of the Book of בראשית?
• What’s on Pornhub?
• What does it mean when I have a dream where my friend died? I had this dream last night where one of my friends died in a shootout and I woke up crying.
• What was the hottest inappropriate sex you ever had?
• Why would Joseph Smith say that polygamy was God's law?
• What is the kinkiest thing you and your sex partner have done in bed?
• What can I do to deal with disrespectful children?
• Do you think President-Elect Donald Trump won the presidency fair and square, or do you think the GOP resorted to blatant unlawful practices to tilt the election?