A blonde walks into a hardware store and asks the salesman, "Can I buy that TV?"
The owner answers, "I don't sell TV's to blondes!" So the blonde dyes her hair and asks the some question, but she gets the same answer. So she shaves her head and goes back and asks again, but yet again she gets the same answer.
"How did you know I was a blonde?" she asks."
"Because," he replies, "that's a microwave oven."