One day a blonde went into a department store.
She said to the owner, "Can I buy that T.V.?"

The owner replies, "No, you're a blonde".

Next day the blonde comes into the same shop with black hair and says, "Can I buy that T.V.?"

The shop keeper says "No, you're a blonde."

Next day the blonde comes in with pink hair and says, "Can I buy that T.V.?"

The owner says, "No, you're a blonde."

Then the blonde goes, "How do you know I'm blonde?"

He replies, "Because it's a microwave."