I used to believe that leaf blowers had an unlimited supply of air in a tank, not that they blew a blast of air taken from the outside!
A childhood belief about around the house

others believed things like this
- I used to think that the TV show "Shark Tank" involved actual sharks in a tank.Anon
- I used to think that in public toilets, the cleaning lady actually lived in the supply cupboard.Anon
- My parents used to own a Restaurant. I belived the lobsters in the tank were pets.— Ned
- After seeing Thomas the Tank Engine, I believed that all the locomotives in the world had a face.— Joe
- I used to believe that peoples ears grew so that when the world blew up we would be able to fly away.— Ears
- When I was a child and the wind blew strong I used to believe that someone was hiding under the bed.— FER