My girlfriend used to believe that shaving cream would actually let your hair fall out. (She didn't realize her mistake until I told her - she was 25 at the time...)
A childhood belief about hair

others believed things like this
- I used to think that if i put conditioner in my hair before the shampoo my hair would fall out.— Jerry Moe the Gimp
- My parents told me that when the ice cream van was playing music, it means he's run out of ice cream :(Anon
- My dad told me that ice cream vans only play music when they have run out of ice cream. Anon
- when i was a kid my mother told me that when the ice cream man was playing his music he was out of ice cream— Lynnzea
- My girlfriend believed someone who told her that chewing gum was made from dogs bones!— tony
- My mom told me that if I didn't wash my hair black widow spiders would come live in it.— grew up in Nebraska