I was told that snakes travelled around in the plumbing and occasionally emerged from the toilet, and sometimes an unfortunate person would be sitting down there at the time.
As a child, I figured three things: One, that this was a ploy to stop me spending so much time in the bathroom; two, that it was hard luck for the snake to have to swim through all that mess, so who could blame it; and three, that it was obviously untrue, because how could a snake breathe underwater?
It was with mixed feelings some years later when I found out that this actually does happen.
A childhood belief about general

others believed things like this
- I thought all snakes were venomous and you always die if you get bit by a snake— Elviessa
- I used to believe that if I sat on the toilet too long a snake would come up and bite me.— Cheesemonkey
- i used to believe that pools had underwater doors that sharks were going to swim out of.— marky
- My dad would say "The snake's are barking" when he farted.— Big1
- i used to believe that when i used the tolit a snake will come out and bite your butt. lolAnon
- i used to believe that the signs for curvy roads were for snake crossingsAnon