I used to believe that radio waves were actually thousands of microscopic, kayak-shaped, silver flying machines with tiny men inside them who drove from the radio station all the way into the antennae of the car radio. They couldn't fly well inside tunnels, though.
A childhood belief about physics

others believed things like this
- I used to think tiny little people were inside my mothers radio singing to me.Anon
- I used to believe there was a newsreader inside the radio where the light was!!— Christine
- When I was little, I was convinced that musicians lived inside the radio...little versions of them, that is!— pcmkrfn
- I used to wonder how they managed to fit the orchestra into the radio station.
— sally - I use to believe all the people singing on the radio were IN the radio.— Yvonne
- I used to think that when a song finished on the radio it would play again on the next station— Maria