When I was 5 I used to think that water was made from everything that went down the drain, so I wouldn't drink it because it really grossed me out. It wasn't until my Dad told me that water was pure and that God made it for us that I could drink it again.
A childhood belief about water

others believed things like this
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- I thought tonic water was toxic water and wondered why would anyone drink it if it is toxic?— Dr.Badguy
- My mum used to tell me that you couldn't drink water out of the tap from the bathroom as it was poisonous.Anon
- When I was young I refused to drink well water because I thought it came out of whales.— itodd
- I used to think that if I ate a fruit seed it would grow in my stomach if I drink water after thatAnon
- if you drink water from unsafe places, frogs will grow in your stomach...— Olivier