I used to believe that the tap water at basins in public toilets and at schools was somehow derived or tainted from the urine.
A childhood belief about general

others believed things like this
- I thought the "To Let" signs on buildings meant they were public toilets.— Scottish Laddie
- I used to think that in public toilets, the cleaning lady actually lived in the supply cupboard.Anon
- I used to think water towers were where everyone's uh...waste...went to from the toilets.— Stephanie
- When I was little I thought that my urine was stored in my scrotum until I needed to wee.— Bryan
- i used to believe that public houses were just houses were the public could go and liveAnon
- I used to think that tampons were meant to absorb women's urine so they wouldn't have to go to the bathroom.— Koyaanisqatsi