Here in Australia you usually see two water towers next to each other, one big and wide, the other tall and thin.
When i was Little i use to to think one was for cold water and the other was for hot water (seemed logical at the time) untill one day i asked my grandfather if one was for hot water, after everyone stoped laughing i found out the truth.
A childhood belief about water towers

others believed things like this
- ***I used to believe that water towers was a place that someone lived and they controlled the water.— C H R I S T E N
- i used to think water towers were houses for really tall people. I thought they had big heads to.— Alyssa
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt
- I used to believe that hot water was red and cold water was blue.Anon
- 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 splashed water on the wall during a bath, the water would turn into spiders— justin