When a boy gets a haircut, some of the hair falls into the collar of his shirt. If he doesn't take a shower within a certain amount of time after the haircut, he will be plagued with chest hair when he becomes a man.
A childhood belief about hair

others believed things like this
- I used to believe that if I cut my dolls hair it would grow back just like mine did after a haircut. — diamond girl
- after my mom told me I had strawberry blonde hair - I used to look for the strawberries after I got a haircut— pearpod
- My mum always told me to stop chewing my hair or else i would get a hairy chest! hee, hee! x— Kirsty
- Eating potatoes with skins on puts hair on your chest— Muddinyori
- I used to think that everybody's hair was black and if you had blond hair, you dyed your hair.— ~_~CoolKid93_~_
- I used to hold my hand over my hair whenever i left the house and it was windy incase my hair blew away— lisa