I used to believe that fire trucks carried all the water they used to put out fires in the back of their trucks, so if they ran out of water, another fire truck would have to come.
As embarrassing as it is (i'm 19), I only found out yesterday that they connected their trucks to a water supply underground.
A childhood belief about in the street

others believed things like this
- I used to believe that fire trucks were filled with water. — Renee
- I used to believe that firemen drove around in their fire trucks and started fires. I wondered why.— Albert
- I used to believe that semi trucks were cement trucks, and that actual semis were just big trucks.— Joe Schmoe
- I used to think that fire trucks and ambulances drove all the way back to the station backwards.— Tim
- i use to believe....that cement trucks carried balloons to the Bozo circus....lol— Laura
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt