My friend and I were once told my her mother that it was scientifically impossible to jump on a trampoline without smiling. We were determined to prove her wrong. So after a few tries, we finally managed to jump and keep a straight face. After this we turned to her and said, "Ha!" She then told us she made it up, and we were dissapointed.
A childhood belief about physics

others believed things like this
- When I was little my dad told me that monsters jump out from spotlights and I belived it...— Cassie
- I used to believe in my imaginary friend dooodle.
Doodle was a stickperson and was always smiling.— Samantha - My mom always told me if I made an ugly face it would stay that way forever.Anon
- I ues to believe that if I broke th TV the people would jump out and try to catch me.— Lazyj (K)
- I used to believe that if you jump in a toilet, they lead you to another dimension.— beep.
- -nursery rhymes-
i used to believe that cows could jump over the moon when I was a kid.— Aloysius