While out jogging in the park one morning, a man found a brand new tennis ball on the ground.
He looked all around him, and seeing that nobody else was in sight, he picked it up and slipped it into the pocket of his shorts.
Later, on his way home, he stopped at a pedestrian crossing, waiting for the lights to change.
A girl standing next to him couldn’t help but notice the large bulge in his shorts.
“What’s that?” she asked, pointing at his shorts.
“Tennis ball,” came the breathless reply.
“Oh my gosh,” said the girl sympathetically… that must be very painful… I had tennis elbow once!”