Three blondes were walking through the desert when they found a magic genie's lamp.

After rubbing the lamp to make the genie appear, he said, "I will grant three wishes, one for each of you."

The first said, "I wish I were smarter."

So, she became a redhead.

The second blonde said, "I wish I were smarter than she is."

She became a brunette.

The third blond ordered, "I wish I were smarter than both of them!"

So, she became a man.