I used to believe that a man had as many testicles as he had children. So I thought the Catholic guy next door had nine balls and that I'd only have two kids when I grew up.
A childhood belief about reproduction

others believed things like this
- When i was little, i thought that when i grew up i could only have two kids because i only had two testicles.— nick
- I originally thought "balls" was slang for buttocks instead of testicles.Anon
- I used to think God and Jesus were the same person. And I grew up Catholic.— Jackie Mullinix/st louis
- I used to think that girls had "balls" and not boys, and the "balls" were slang for breastsAnon
- i always thought it was Grape Balls of Fire instead of Great Balls of Fire— Courtney
- that when I grew to be an adult my parents would be children.— Rainbow