When I was younger I couldn't figure out why telephones needed electricity if a tin can 'telephone' wourked fine without it.
A childhood belief about telephones

others believed things like this
- I used to believe that "euthenasia" was "youth in Asia", and I couldn't figure why that was A Bad Thing.— Kellye
- when i was really young, i couldn't figure out why i can't get older than my older sister.— angela
- I used to believe electricity came from lightning.Anon
- i used to believe lava and water made electricityAnon
- I used to believe that you could pass things down the telephone.Anon
- I used to think that everyone had a little person just like them that all lived in the telephone.— Jenni