When I was a kid I used to believe that if you rubbed your eyeballs too hard that they would fall back into your head. This meant that you would no longer would be able to use them because they would be floating around inside your head.
A childhood belief about eyes

others believed things like this
- someone could unscrew my belly button, and if they did, my head would fall offAnon
- my sister when she was little thorght head lice tried to borrow into her head to get to her brainAnon
- I used to think headquarters meant somebody's head cut into 4.Anon
- I used to believe that your brain was a red rubber ball inside your head.— Greg
- i used to belive that if i fell on my head my head would come off while i was doing a cartwheelAnon
- I used to think that being fired meant they set you on fire.
Or they just chopped off your head.Anon