I used to believe that a cuckoo actually looked like an owl. And even now when i know it doesn't, i still imagine an owl if i hear a cuckoo.
A childhood belief about birds

others believed things like this
- Used to wonder why a hamburger is called that if it doesn't have any ham...— Axecutioner
- I was told that if one doesn't cover their mouth when yawning that their soul would escape.Anon
- My mom said she had eyes in the back of her head. I looked and looked, but never found them.Anon
- Yesterday I realised that invisible ink doesn`t make me invisible.— Jonathan Eleven years old
- I used to believe cartoons where real people. You can imagine how that went... — Emma
- At a young age I couldn't imagine how people without glasses could marry the ones wearing them. — Ana