I used to believe that there was a little man living in the bathtub drain who drank all the water when you unstopped the drain. If you didn't get out before all the water went down he would swallow you.
A childhood belief about bathrooms

others believed things like this
- how many us believed you would go down the drain with the bath water? I did!— Amy
- I used to think that trolls lived in my shower drain and showered with my dirty water— Troll bather
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt
- I used to believe that honey was made from bees' pee when they drank too much water.Anon
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- I used to believe that if i splashed water on the wall during a bath, the water would turn into spiders— justin