Not really a belief, but more a confussion.
As a young kid, when I'd get out of the bath, I'd never know whether to towel dry my hair or my body first.
If I dried my body first, my hair would drip onto my freshly dried body, and if I dried my hair first it would begin to soak up the water from my wet body.
It's a wonder I ever managed to dry at all.
A childhood belief about bathrooms

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 "extra body" shampoo meant you could use the runoff suds to clean your body.— Christy
- Split walnuts... i used to think they were dried pig noses!!— SaMmI LaMy
- i used to believe that dried prunes were giant rasins.— Jacquyln
- My brother used to believe that dried out boogers were actually "paving" the inside of your nose. — sm
- When I was younger I believed that pistachio nuts were made out of beetles that had somehow been dried out. — Alyssa