When I was little, I thought that if you slept with your arms up at all (like under your head) that little tickle-y men would come tickle you under your arms.
A childhood belief about sleeping

others believed things like this
- When I was younger I thought I made up a new way to tickle someone--by tickling their stomach.— Amelia
- 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
- We used to think that if you ran swinging your arms around, you would run faster. — Christine
- that if I flapped my arms hard enough, I could get airborne.— DeQuendre
- When my grandma was little, her dad would tell her that the freckles on her face and arms were fly crap.Anon