When I was about five years old I used to believe that Ursula the sea witch from the Little Mermaid was going to come up from the bottom of my covers and eat me, I never went to bed without securing the covers underneath me.
A childhood belief about witches

others believed things like this
- I used to believe that if i took the covers off at night i would freeze to death.— RockerGirl
- I used to believe that undercover cops hid under covers/sheets. — Holly
- I used to believe that if I farted in bed, a monster would pop out through the covers and tickle me.Anon
- my sister used to tell me that manhole covers were direct portals to hell.— autumn
- 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 if you slept with the covers covering your neck, vampires couldn't bite you. — Moot