When I was little, I thought that ALL teenage boy wore big black sweatshirts and were fat. I didn't know any teenage boy like that when I was that young. I didn't even know any teenage boys. I have no idea what led me to believe this.
A childhood belief about appearance

others believed things like this
- When I was a kid, I thought the musical Mamma Mia did songs from the A*Teens (the teenage version of Abba)Anon
- I always thought cats were all girls & dogs were all boys ... I have no idea why.Anon
- I used to think the Back Street Boys were black. I also thought Seal was a boy band. — Tufty
- I used to think that Batman was Blackman. He wore a black superhero outfit, so it made sense to me.Anon
- that cats were only girls and dogs were only boys. I definetly didn't get the whole reproducing thing yet.— Jamie
- When I was young, I thought that rice was actually ants eggs! Didn't stop me from eating it though (: -@— Doh!