When I was in about the fifth grade, A group of friends and I went up to a younger kid on the playground and asked him where babies came from. We knew of course, but we wanted to tease the little kid to see what he would say.
His reply: "The plus minus [pregnancy] test."
A childhood belief about reproduction

others believed things like this
- I once asked a friend if test-tube babies had bellybuttons or not.
I was eighteen years old.Anon - in grade school, i used to believe that test tube was a naughty word and was embarassed to say it.— miss sara
- I used to believe that my mum was the queen. She does look a bit like the queen... minus the orb and sceptre.— Vix
- I believed that women who wanted babies ate a seed, which then grew into their baby. — World's Worst Scientist
- Before I knew about death, I used to think people turned back into babies again after they got old. Anon
- when i was younger i thought that babies could see out of the mummies belly button— strawberry