In the fourth grade, my girl friend and I (I'm also a girl) had an argument over which hole the baby came out of.
At the time neither of had a very good understanding of our own anatomy.
I didn't know I had a vagina because I couldn't see it, I thought you peed out of your clit, I knew it wasn't called a penis, so I just called it my pee thing. So I figured the baby came out your butt hole since one can't fit out a tiny little pee hole.
My friend was aware she had a vagina, and she referred to it as a "pee hole" since neither of us were even aware of the word "vagina". So she said that the baby came out your pee hole (she was talking about a vagina, but I thought she was talking about a clit)
So we argued about it for the longest time until I learned I had a vagina thanks to a book about "girls growing up"
but I still thought you pee'd from your clit.
It wasn't until much later that we realized there is actually a little hole between the clit and the vagina where the pee comes from. Turns out we were both wrong about something.
A childhood belief about rude bits

others believed things like this
- when i was 6 i thought girls peed out of there butt hole!— axel
- When I was a little girl, I thought all babies came from 'China' (a Vagina)— Lainie
- I thought that to breastfeed, a woman had to poke a hole in her nipple (like the hole in a bottle nipple).— Imani B.
- I don't know why or where I got this from, but when I was little, I referred to my vagina as my "goose". — StrangeLilGrrl
- i used to believe that women peed out of their arse and pooed out of their vagina— TIM wilson
- i used to believe that a penis was the same as a vagina except really long— *stupid*