I thought that pubic hair was called public hair. The word inventors were making it a joke because it's supposed to be private.
A childhood belief about hair

others believed things like this
- When I was a kid, I wondered why they called it "public hair" when it was so private.Anon
- I used to think that everybody's hair was black and if you had blond hair, you dyed your hair.— ~_~CoolKid93_~_
- When I was little I thought that dying your hair means you kill your hair.Anon
- I thought when Grandma's hens were cackling, they were giggling about some private joke in the henhouse. — Not a farm kid
- I used to hold my hand over my hair whenever i left the house and it was windy incase my hair blew away— lisa
- I used to believe that you could curl your hair by twirling a strand of hair wrapped around your finger— Anonymous