I used to believe...

From dan0:

I believed that one was born with a perfect sphere of booger-material at the top of each nostril. Each nose-picking whittled away at these spheres. I don't remember whether or not I thought these spheres served any purpose, but I recall lying on the floor at nap-time in pre-school with my finger up my nose thinking I'd have to pace myself if I wanted any left when I became an adult.

Sure, you're laughing now, but what weird stuff did you believe when you were a kid?