I used to believe that if you folded a letter with the recipient receiving the blank side upon opening, then he or she would think there was nothing on either side of the paper.
A childhood belief about reading

others believed things like this
- the summer that I turned 11 I waited out side on the step all summer for my hogwarts letter... ;D — Ginny weasley... not really
- I used to believe that if I chewed on one side of my mouth too much the other side would get jealous.Anon
- i used to believe that everyone had a twin on the other side of the world.— tahnee
- I used 2 think that the scar on my side said "UNUSEABLE" LOL!!!!!!— John In Pennsylvania
- Until I was 23 I used to think the ginger put with sushi was a side of ham.— maari
- I used to believe that if I scratched one side of my body I had to
scratch the other to be "even".— Greg