So a guy's walking down the street with a tennis elbow, and he's wincing in pain. On the way, he sees a tennis ball and puts it in his pocket surreptitiously. He walks home where his neighbor's daughter rushes over, and almost knocks him off his feet. "What happened?," She asks. "Oh it's just, I have a tennis elbow, and it hurts bad." Then she says, "What's that in your pocket?" The guy responds, "A tennis ball". The girl goes, "Ooooh. Sucks for you."