Iusedtobelieve.com
Can't claim that i found this, it was in the Guardian Guide today, but boy is it a good 'un
It's a site of what people used to believe when they were kids. Please stick your favourites up, the quality is variable, but some of them are wonderful. My favourite so far is
"When I was a young grade school girl in the '60's, I always wondered what a penis looked like. I imagined it to be like a 7 inch nightcrawler protruding from a hairless crotch, ending with a shaggy 3 inch main of hair. A sort of pornographic Dr. Seuss visualization. I had nightmares about coming into personal contact/confrontation with one of these strange creatures."
Unfortunately you have to view the source to be able to copy stuff, as they won't let you lift it directly.