| A guy is out jogging when he sees a tennis ball in the gutter. He picks it up and puts it in his pocket, and keeps on going.A while later he comes across another tennis ball. He puts that in his other pocket. He resumes his jog and meets up with a friend also out for the exercise ,
 and they carry on together.
 After a while his friend says "What are those lumps in your shorts?
 " tennis balls" he replies.
 "Wow!" says his friend, "I've had tennis elbow, and that was bad enough..."
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