A blonde walks into a store and goes over to look at some appliances. The salesman walks over and asks if she needs some help. "I'd like to buy this refrigerator." The salesman replies "Sorry we don't sell to blondes."
So the blonde goes home and dies her hair brown. She goes back in the next day and again asks to buy the refrigerator. But again the salesman says they can't sell to blondes.
The blonde goes home and this time dies her hair red. She walks in the next day asking for the refrigerator. And again the salesman tells her they don't sell to blondes.
Finally the blonde asks how he knows she is blonde. The salesman replies "Because that is a microwave."