I was convinced that the water from the hot tap (the cold was fine) was highly poisonous, and that if you drank it you'd die. And I sort of still do!
A childhood belief about bathrooms

others believed things like this
- I used to believe that the dust at the top of doors was highly poisonous and could kill you.Anon
- My mum used to tell me that you couldn't drink water out of the tap from the bathroom as it was poisonous.Anon
- 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 hot water was red and cold water was blue.Anon
- I used to believe that honey was made from bees' pee when they drank too much water.Anon
- I was convinced that hot air sinks. Why else are mountain tops cold, and Death Vally is so hot?— Not-my-wife