My dad told me once that holes in rocks on the beach were made by 'rock worms'. Years later when I was about 11 I mentioned something about rock worms, and my family found it rather amusing.
A childhood belief about creepy crawlies

others believed things like this
- I always thought that the gummy worms were real worms that had been mummified— The Ice Cream Sandwich Monster
- My friends and I used to believe that if you planted a rock, it would grow a rock tree. Anon
- I used to believe the the Elton John song, "Crocodile Rock" was about a Crocodile, named Rock.Anon
- Until I was a teenager, I believed that rain made worms came out of driveways.— Marc
- I believed that linguini was made of tape worms and was scared to eat pasta for a long time!— Mojo!
- When I was around seven years-old, my friend and I put a rock in a microwave and thought it would melt.— Lars