When I was younger my sister told me that running in cold weather would make me short. I was already short so I was terrified to play outside in the cold. I didn't learn this was untrue until I asked my college anatomy professor about it the other day.
A childhood belief about appearance

others believed things like this
- i was scared to fart outside in cold weather because i thought u would be able to see the steam.— xJeNneSceNcEx
- Since the girls name Jackie is short for Jacqueline, I thought the boys name Jack was short for JackalAnon
- My daughter once asked if God was short for Godfrey— keefdave
- I used to believe my father when he told me that if I sat on cold concrete I would get hemorrhoids.Anon
- My mum told me that cold custard (which I hated) was in fact Banana Blancmange. I lapped it up for years.— Chalky
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt