I used to believe that if too much water went into the overflow hole in the bathtub, it would fill inside the walls of the bathroom and flood the house.
A childhood belief about bathrooms

others believed things like this
- i thought that if water towers fell the city would flood. So everynight i would stay up worrying.— o.O haku
- That there was a zombie living behind the bathtub in the upstairs bathroom.Anon
- That blue cheese was made by scraping mould off bathroom walls. My mother actually told me that.— sandee
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- I used to believe that if you opened up an umbrella inside your house that the whole house would fly awayAnon
- My mum used to tell me that you couldn't drink water out of the tap from the bathroom as it was poisonous.Anon