I used to believe that if you bathed with the light off at night, when you pull the plug out a hippo would come up into the bathroom through the drain.
A childhood belief about bathrooms

others believed things like this
- I used to believe that once you pulled the plug in the bath a shark would swim out of the drain and eat you.— Amy
- when i was around 3 or 4 i belived that the sea had a large plug like a bath and it was draind every night — James Cameron
- If you left a plug socket on with no plug in all the power would run outAnon
- i used to think the toilet was a hippo and you fed it by poopin ofr peeing— russ
- When was 5-6 I used to think that leather was made from hippo skin.— Richard Davies
- I once asked my mom if my grandma got wrinkles on her wrinkels when she bathed. Go figure....— Kitty