I used to get the words "vagina" and "Virgina" mixed up. This later led to an incident in the 3rd grade when the teacher had called upon me to name the 50 states and I my reply went something like, "Alabama, Alaska, Arizona... Utah, Vermont, Vagina..."
I got a citation for that.
A childhood belief about rude bits

others believed things like this
- I used to think that Hawaii and Alaska were different countries. I wondered were the other 2 states where!— x-nicola-x
- i used to believe that pee came out of the vagina— Janey
- i used to believe that a penis was the same as a vagina except really long— *stupid*
- 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 if you have sex for too long, the penis would stay in your vagina— Angela
- Until I was ten or eleven I thought a vagina was a "pagina" Anon