When I was little, I believed that any water that went down the drain without any soap in it, was recycled and came back through the faucet.
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 believed that burglars ate soap & lipstick— Karen
- The phrase 'Recycled toilet paper' always worried me.Anon
- I used to think that the wax statues at Madame Tussauds were made of recycled candles and crayons.Anon