For a long time when I was little I didn't understand the difference between your left and right and the left and right of someone that was facing you. In dance class, our teacher was always saying stuff like "my left, your right", and somehow I took this to mean that all adults' left & right were reversed from kids'.
A childhood belief about getting older

others believed things like this
- when I was a kid I used to believe if I left the shoe facing the person would die— milena
- I used to think for a very long time, that spam was left over animal parts with salt.— Ebony
- I used to believe that if you left crumbs out for a long period of time, they would turn into ants.— Bylaberrie
- I used to believe that coin change could turn into actual paper money if you left it alone for a long time. — Marcus O
- I used to think that if you left the taps on for too long the sea would run out.— fletch
- I thought if I left the door open too long, a dog would come from the cupboard in the washroom and eat me
Anon