OK the timing is just perfect for this:
The Vet (who is an avid golfer) is on his way home with the golf balls in his pocket. He sits down at a bus bench next to an attractive blond. The blond can't stop staring at the bulge in the vets pants, and when he notices her looking he says "golf balls". Well the blond just gets a very sad look on her face and asks "does it hurt as much as tennis elbow?"
Ba-doom-boom!!! 😀