A lady goes into a shop and says I'd like to buy that TV, the salesman says sorry we don't sell to dumb blondes.
So she leaves the store but really likes that TV so she dyes her hair brown and goes back. Hi she says I want that TV right there, again the man answers we don't sell to dumb blondes. This time she gets angry and goes home. She thinks that he must have recognized her face so the next day she puts on makeup and big sunglasses. She goes back and says yes sir I want to buy that TV. Once again, sorry we don't sell to dumb blondes. So she said how do you know I'm blonde?. He says because that's a microwave.