My parents used to have plastic plug-socket protectors (i.e. the plug prongs attached to a shield bit) to prevent inquisitive toddlers from electrocuting themselves.
Apparently I was of the belief that they were actually there to prevent the electricity from flowing out!
Pretty sensible, I thought! :)
A childhood belief about physics

others believed things like this
- If you left a plug socket on with no plug in all the power would run outAnon
- I used to believe my dentist could give me a shot to straighten my teeth and prevent cavities.— sircigar
- My dad use to tell me that if I swallowed gum it would plug up my bum hole and eventually I would explode,— Carrie
- when i was around 3 or 4 i belived that the sea had a large plug like a bath and it was draind every night — James Cameron
- I used to believe that once you pulled the plug in the bath a shark would swim out of the drain and eat you.— Amy
- I believed that I had a fake right big toe, having lost my real one in the plug holder (thanks Helen!)— Mike