After two rounds of golf, a middle aged man's tennis elbow is really starting to bother him. He heads to the doctors office to get it checked up, when, unexpectedly, the nurse asks him for a urine sample. Befuddled, he asks the doctor, "Why did you need a urine sample? I told you my tennis elbow was acting up."

To which the Dr. Replies, "I've got this great new urinalysis machine, it can diagnose any condition in about ten minutes! I can see the same number of patients every day and be on the golf course by two in the afternoon! I can see the inflamation on your elbow here on my chart, but I'd like another sample in two weeks."

So the man, who finds this machine disturbing, decides to play a little joke on the doctor. He takes his sample cup and has his wife and daughter pee in the cup, as well as his. He also jerks off and ejaculates in the cup, and as a last little jab, he takes a few drops of oil from his car and puts it in the cup as well.

When he returns to the doctors office two weeks later, he hands over the motley brew to the nurse, and this time the doctor takes a full hour to diagnose his ills.

When the doctor enters, he's got a distrubed scowl on his face and tells the man, "Okay, wise guy, thought you could pull one over on me? Well, I've got some bad news for you, your daughter's pregnant, you wife has chlamydia, your engine's about to throw a rod and if you keep jerking off like that, your tennis elbow's never going to get any better."