Some blonde enters a electronics store and when a salesman comes by she points and says: "I want that TV"
The salesman replies he won't sell anything to dumb blondes.
The next day the same woman goes back in the store with her hair died black, she points and says "I want that TV"
The salesman replies afain he won't sell anything to dumb blondes.
Confused the blonde leaves the store, "how could he know? my hair was perfectly black"
Yet the other day shes back again, now with hair shaven, even her eyelashes and eyebrows removed, she points and says " I want that TV"
The salesman replies he won't sell anything to dumb blondes yet again.
Even more puzzled the blonde decides to ask the salesman how he knew, so she goes back in the store and asks her question, on wich the salesman replies: "its very simple miss, these are microwaves the TV's are over there!"

It's one of these days...