After watching an advert on telly for a bathroom cleaner when i was younger, i believed that each house had a certain amount of water to it, and that if you used too much it would run out and the sink would fill with green gunge. To this day i always make sure the taps are turned off properly!
A childhood belief about bathrooms

others believed things like this
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- When I was younger, I thought a serial killer was a person who ate a ridiculous amount of cereal— Aja
- I used to think that if you left the taps on for too long the sea would run out.— fletch
- that the green traffic light turned blue when it was off— Kriket Evens
- When I was younger, I believed that squinting in a storm would make you cross-eyed... forever.Anon
- When I was a kid, I used to believe if you were watching TV, and you turned it off, it paused.Anon