I'll tell you story.

A blonde went to the store and told the shop assistant
Blonde: I want to buy that TV
S. Assist. Sorry we don't sell TV to a blonde

Blonde went home and dye her hair into brunette and went back to the store.
Blonde: I want to buy that TV
S. Assist. Sorry we don't sell TV to a blonde

Blonde went home again and dye her hair into black and went back to the store.
Blonde: I want to buy that TV
S. Assist. Sorry we don't sell TV to a blonde
Blonde: how can you tell I am blonde?
S. Assist. Well Mam that is simple you want to buy a TV but you are pointing at the microwave!