I used to think that black people had hair made of yarn.
I also used to think that anyone could grow a beard if they wanted to - even women. I didn't know that beardless people shaved - I just assumed if you wanted a beard, one would grow, and if you didn't want one, it wouldn't grow.
A childhood belief about hair

others believed things like this
- How could Baby Jesus be born on Dec 25th, get tall, grow a beard and then die, all by Easter. Whew!— Joe
- i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- Migets were people who were bad when they were kids and there parents didn't let them grow up.— Teresa
- 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 used think that when i would grow up that i could become a cat if i wanted to.— may ray
- I used to believe that I would never grow up, because I "wanted" to remain a child. Ha. That one fell throughAnon