I used to believe the overflow drain in our bathroom sink was a way for the water company to tell if I was using too much water. My mom had told me this when I asked what it was for.
A childhood belief about bathrooms

others believed things like this
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- 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 asked my father what holy water was. He told me it was the priest's bathwater. — Gwen
- 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