This one's a bit embarrassing. I heard someone referring to an old, bald guy as an "old coot", so I thought that a coot meant a bald man.
A childhood belief about hair

others believed things like this
- i used to believe that bald people were evilAnon
- I used to believe nun's shaved their heads and were completely bald.— Mark
- our grandfathers bald head was because our granmother pulled it out when she got mad at him— daniel copeland calif,u.s.
- I used to believe that cancer itself made you bald, rather than the chemotherapy treatment!— Maggie
- i use to believe that bald people had such shiny heads cause they didnt eat there vegatables — TEM
- I used to be convinced that there were bald-headed beige aliens outside my toilet window.— Phil