My best friend in high school had an older sister who continued to have odd beliefs about various animals long into her adulthood. To make it all more interesting, she had a habit of mentioning them seeming with no reference to whatever else we might have been talking about at the time.
The one I recall most easily was when she just dropped the statement "Sheep turn into goats." one time while we were trying to figure out what movie we wanted to go see that night.
A childhood belief about general

others believed things like this
- I used to think that if I stared at the sun for a long time, I could make day turn to night.— Big J
- when i was really young, i couldn't figure out why i can't get older than my older sister.— angela
- i used to believe that if you watched TV for a long time, your eyes would turn into squares.Anon
- We used to turn our walkie talkies on high at night and believed were communicating with aliens!— Dreamy
- I used to believe that if you left crumbs out for a long period of time, they would turn into ants.— Bylaberrie
- I used to believe that coin change could turn into actual paper money if you left it alone for a long time. — Marcus O