I used to believe that there was a scary version of Pee Wee Herman under my bed who would pull me under with huge spider-like arms and tickle me till I died. (I am EXTREMELY ticklish)
A childhood belief about under my bed

others believed things like this
- I used to beleive that a catacism(spelling?) was an extremely painful Christian version of a bris.— Mike
- I used to believe that Marilyn Manson was a extremely scary woman!— Tim_NOrway
- If you pull off the leg of a spider it will rainAnon
- When I was liitle, I used to believe that if a spider would bite me than I would become Spider-Man!!!— IronManxD
- I used to believe that if I farted in bed, a monster would pop out through the covers and tickle me.Anon
- i used to believe that when i had an itch or a tickle, it was because there were ants crawling beneath my skin— Willa