I used to watch bodybuilding competitions on TV. I used to believe that the bodybuilders were hairless because their huge muscles had grown up and over their body hair.
A childhood belief about hair

others believed things like this
- I thought that eating chicken gave me muscles (chicken and muscles sound the same in Mandarin).— NG
- I used to believe that after I cut my barbie's hair, they will grow again. They've never grown :(— Duda
- i used to believe that if someone take his bath with a hair shampoo, their body will become hairy.— roslin
- I used to believe that the meat you eat is turning to be your own muscles.— Yossi
- If you eat your fruits and vegetables you will grow much faster and your muscles will be very happy!— Bruno
- I used to believe that grown-ups were born "grown up" and that I would stay a little kid forever.— Still A Kid