Call this obsessive compulsive disorder if you will, but I used to think that if you twisted the arm/head/whatever of a toy all the way around, you'd have to twist it back the same number of times, back to how it was before, or else that toy would be in silent agony.
A childhood belief about toys

others believed things like this
- My mom always told me she had eyes in the back of her head. — Ellana
- I really believed, underneath her hair, my mom had an eye in the back of her head.— Jessica
- When I was little, I believed my parents really had eyes in the back of their head.— Tera
- i used to believe that my preschool teacher had eyes in the back of her head.Anon
- My mom said she had eyes in the back of her head. I looked and looked, but never found them.Anon
- I thought if i picked my nose too many times, my head would blow up.— i m a moron