When I was very young I thought a man's penis was called a "bill", and when my dad went to the bathroom his penis would coil up in the toilet. I always wondered how he managed not to ever have it flushed.
I also thought, for some reason, that "sex" meant cutting off the man's "bill" with the help of a doctor.
A childhood belief about rude bits

others believed things like this
- When I was around four, I thought every black man on television was Bill Cosby.— Linda
- Up until I was about 14, I always thought that the penis was called a "pickle."— Amanda
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- I used to believe that gay sex involved a man sticking his penis inside another man's penis.Anon
- We use to think the male organ (penis) was called a PUDDLE....
My twin sister and I both called it that...Anon - I used to think that Bill Murry and Tom Hanks were the same person.— Andy