Washable markers could actually be washed off of paper
A childhood belief about toys

others believed things like this
- I never used to take shower after going to the beach, because i thought that tans washed off right away.Anon
- I always wondered why shepherds washed their socks by night. (correct lyric: watched their flocks)— MaggieNJ
- I used to think that when you sent a fax, the paper went through the wires.— em
- When I was little, I believed that clouds came from paper mills.— Ryne
- I use to think that mummies were wrapped in toilet paper.— Glowworm
- cause i'm just a paper bag rider....
or it might have been paperback writer by the beatles....Anon