A blonde walks into Best Buy. She sees something she likes and finds the nearest clerk and asks "how much does this microwave cost?"
The clerk says "sorry, we don't sell to blondes," and shes walks out of the store quietly. Later that day, she goes home and dies her hair red. The next day she goes to the same store, finds the same item and the same clerk. She asks "How much are you selling this microwave for?"
The clerk says "Sorry, we don't sell to blondes."
The blond gets this puzzled look on her face and asks the clerk "How did you know I'm really a blonde?"
And he replies "Because that is a TV."