I used to believe that gas station attendants (circa the 1960's) were all men named "Ethel" -- as in, "Fill it up, Ethyl," which is what my dad told the snappily uniformed gas station dude everytime we went to a gas station. (And if you don't know, "Ethyl" was what Premium was called back then!)
A childhood belief about cars

others believed things like this
- I used to think that fire trucks and ambulances drove all the way back to the station backwards.— Tim
- I was told as a young child that if I didn't smile going past the police station, I wouldbe arrested.Anon
- I used to believe that the Fire Station was where all fires occurred.Anon
- When ever we went to the gas station, it was to replace the blinker fluid.Anon
- I used to wonder how they managed to fit the orchestra into the radio station.
— sally - My sister used to think that there was an oil well under every gas station that led directly to the gas pump.Anon