The Magic Genie's Lamp
Three blondes were walking through the desert when they found a magic Genie's lamp.
The Genie came out and 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 her." She became a brunette. The third blonde said, "I wish I were smarter than both of them." So she became a man.