Here's a common belief that should be listed on this website: you can hear the sea if you put a shell to your ear (when it's really just the blood flow in your head, gross as it is).
A childhood belief about water

others believed things like this
- I used to believe that there was an actual show, listed in the various guides, called "To Be Announced."— Donna
- when I was young, I heard that blood had iron in it. I thought blood was red because it was rusty.— Hunter
- I used to believe that the sky is just a very thin blue egg shell— Alan
- I used to think shell macaroni was sea shells.— Don Northrup
- I used to beleive that a mermaid would be singing to you when u listned to a shell. — vprincess
- I didn't understand about boiled eggs until my Mum explained I wasn't supposed to eat the shell as well.— Chris