TV's for sale

Once there was a blonde who walked into a store and said to the owner "I want to buy that TV up there on that cabinet"

The owner immediately replied "No."

The blonde asked why not, to which the owner replied "Because you are a dumb blonde."

She walks out and the next day she walks in with a brown wig on and asks if she can buy that same TV.

The man again says "No, because you are a dumb blonde."

The next day she walks in as herself and says "I know you're not going to sell me the TV, but I have to know, how did you know it was me yesterday?"

The man says "I knew because that TV is a microwave!"