Tennis Balls

One day while jogging a middle-aged man noticed two tennis ball lying by the side of the walk. Being fairly new and in good condition, he picked the balls up, put them in his pocket and proceeded on his way. Waiting at the cross street 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!"