After having "Voyage of the Dawn Treader" (sequel to the lion the witch and the wardrobe) read to me I was terrified by the magical pool which turned anything that touched it to gold. For about a year I had to remind myself that if the water in my shower was like this it would have turned the shower head gold on the way. While this helped, I was never entirely sure whether or not this would stop the flow of water before it could hit me, and I never liked taking both eyes off the shower head at once.
A childhood belief about water

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 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 believe that take a shower meant to go steal a shower from the storeAnon
- I used to think that trolls lived in my shower drain and showered with my dirty water— Troll bather
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D