I used to think there were monsters living inside the walls. This belief was validated when I stuck a key in an electrical outlet.
A childhood belief about monsters

others believed things like this
- As a kid, I thought "No Outlet" signs meant the houses past that point didn't have any electrical outlets.— Julie
- My music teacher once said that music in an electrical piano was made by little tiny men that lived inside it.Anon
- I used to believe that If I stuck my finger really far inside of my belly button I could touch my insides.Anon
- I believed that the inside of a tomato was a small, living creature and I flatly refused to eat that bit.Anon
- When I was little I use to belief that if we swallowed the pit of a fruit, a tree would grow inside us.— Maya
- i used to believe that the no outlet signs meant that noone in that section of the street had electricityAnon