When I was around 4 or 5, I had just learned how to take a shower. To help me feel more comfortable doing it on my own, my parents got a plastic cover for the shower head in the shape of a clown's face. He was smiling widely, and the water came through his open mouth.
It terrified me. I was convinced that it was alive and watching me, and if I took my eyes off of it for one second, it would seize the opportunity to attack. I remember groping blindly for shampoo and soap because I knew I could not look away if I wanted to escape the shower.
A childhood belief about bathrooms

others believed things like this
- 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 take a shower meant to go steal a shower from the storeAnon
- I used to believe that if you took a shower after a day of tanning the tan would come off in the shower— Shar
- I used to think that if you go into a shower nothing can hurt you because you're protected by water — Foxxip
- 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 think that trolls lived in my shower drain and showered with my dirty water— Troll bather