One day, a man noticed two tennis balls lying by the side of the road while jogging. He picked the balls up, put them in his pocket, and proceeded on his way. Waiting at the cross walk for the light to change, he noticed a beautiful blonde standing next to him smiling. "What are those big bulges in your running shorts?" she asked. "Tennis balls," the man said, smiling back. "Wow," said the blonde, looking upset. "That must hurt. I once had tennis elbow, and the pain was unbearable."