When I was a little kid, about 4 or 5, I found out that birds ate gravel for their digestion, so I figured eating tiny pebbles was good for me, too...until I learned people didn't have gizzards (and what gizzards did).
A childhood belief about eating

others believed things like this
- When I was small my Grandfather told me that the reason I had freckles was from throwing pebbles in the sewer!— All Grown Up Now!
- I used to believe that tv people were tiny famous people that lived inside that box with a window called TV.— Miguel Horacio
- My dad told me that the reason Birds didn't get electrocuted on overhead wire was they had rubber feet!!— Derricki
- I used to think tiny little people were inside my mothers radio singing to me.Anon
- I thought that little tiny people changed the color of the stop lights.Anon
- I used to belive that there were tiny people in vending machines that gave you your food.— Meah