When I was a kid I believed that people with giant arms lived under my bed and if my feet stuck out of the blankets they would grab my feet and tickle them. I'm now 35 and still refuse to sleep without my feet being completely tucked under the blanket even though I've known for many years now there are no people under my bed.
A childhood belief about under my bed

others believed things like this
- When I got my feet measured by the electronic machine, I thought that the machine will squash my feet!— Helen
- My Grandmother once told me she could unscrew her feet. I believed that for years.— Andy Bettison
- I always had to sleep with my feet under the covers or else speed racer would drive over them.Anon
- I used to believe that when you are 90 years old, you are also 90 feet tall.Anon
- When i was little, i believed that if you slept with socks on, your feet would fall off.Anon
- Until about 6 months ago (I'm 21), I believed a bidet was used to wash your feet in.
Eep!— Rebekah