When I was at boarding school, a girl in my dormitory told me that you only grow when you're asleep, and if you slept on your front, you grew up flat-chested. I spent ages trying to get to sleep on my back, but gave up eventually and resigned myself to pancakedom in later life. Despite sleeping on my front, I'm now a 34F.
A childhood belief about rude bits

others believed things like this
- I used to believe that if I fell asleep lying on my front that my boobs wouldn't grow. And they didn't.— Booey
- I was told that if you sleep on your back you swallow your tongue...I have been sleeping on my side ever since— scotty la
- im a girl and i used to think my mom had a penis and i would eventually grow my ownAnon
- I used to believe that when you had cancer, your bottom would be in front instead of in back. Anon
- I used to only sleep on my back because I thought I would break my ribs if I slept on my stomach.— Molly
- I used to believe that boarding school was where people went to play board games.Anon