i used to believe that "2-in-1" shampoo, which is actually conditioning shampoo, meant it was for washing your hair and your body. I tried that once and it gave me a rash, so for a long time after that I would tell my mom while shopping that I can't use 2-in-1 shampoo.
I still hate conditioning shampoo however... because it doesn't work as well as separate shampoo and conditioner ;) lol
A childhood belief about hair

others believed things like this
- i used to believe that if someone take his bath with a hair shampoo, their body will become hairy.— roslin
- I used to think that if i put conditioner in my hair before the shampoo my hair would fall out.— Jerry Moe the Gimp
- I used to think that "extra body" shampoo meant you could use the runoff suds to clean your body.— Christy
- My friend convinced me that if I used a bar of soap to wash my hair instead of shampoo that I would go bald.— Michelle
- I used to believe that if you used people shampoo on a dog, the dog would turn into a human.Anon
- My older brother once told me that Aussie shampoo was made from kangaroo pee. I avoided using it for years!— Annie