When I was about eight, maybe seven, I had a nightmare that my mom got eaten by a shark.
I took to warning her about every little inch of water she approached, even if it was shower water. Luckily that only lasted about a day or two.
A childhood belief about general

others believed things like this
- I used to believe that eg 1+1=11 and 2+2=22.
Luckily that only lasted until age 2 1/2.— Madi - 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
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D