When I first heard that girls have "three separate holes for three separate functions" (meaning their vaginas are separate from their urethras or anuses), I thought for a long time that it meant girls poop and fart out of separate holes!
A childhood belief about weeing and pooing

others believed things like this
- I used to think Freud was pronounced frood, and that "Froid" was a separate person with a different name!— Gracie
- I used to think that girls' anuses were green. I remember thinking that as late as high school.— Jack
- When I was a kid I thought girls peed out of there vaginas...woops!— Greg
- I actually asked my mother if mixing girls' poop and boys' poop would cause an explosion.— kraine
- I used to believe that girls pee was in their poop, because they have no penis.— s
- I thought that the difference between girls and boys was that girls have teeth.
Anon