As a child, whenever I heard someone speak of Wyatt Earp, I thought they were saying "Wide Earp". So I thought this Earp guy must have been at least rather fat, and that was why he was called "Wide".
A childhood belief about history

others believed things like this
- I would speak in gidderish, convinced that it was some foreign language I had never heard of— Molly
- I used to believe when I was a child ,
during xtmas time animals speak like humans after 12 pm— lan - I thought all you had to do to speak Russian was add -ski to the end of every word!— nateski
- I used to think everyone in the world knew and thought in English, but choose to speak different languages. Anon
- I used to think that adult kangaroos were called Kangas and that child kangaroos were called Roos. Anon
- whenever i heard a melody, i thought it stuck in my stomach when i heard it in my mindAnon