I used to believe that that the bag hanging in the shower was to pee in.
So I peed in the bag hanging in the shower all the time. I found out later that this bag was a folding enema bag.
A childhood belief about bathrooms

others believed things like this
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg
- I used to believe that take a shower meant to go steal a shower from the storeAnon
- I used to think that toilets led to the shower head. That's why I never took a shower :D— scared
- I used to believe that if you took a shower after a day of tanning the tan would come off in the shower— Shar
- "Sex me up, before you go-go
Don't leave me hanging on like a ho-ho!"— Whore-whore - i always thought that people always died with their tongue hanging out— Ernesto Shredder