"Tennis elbow" joke

A man that complained to his friends "My elbow really hurts." I guess I should go see a doctor.
His friend offered DON'T DO THAT! There's a computer at the drug store that can diagnose anything quicker and cheaper than a doctor. Simply put in a sample of your urine and the computer will diagnose your problem and tell you what you can do about it. And it only costs $10.00
The man figured that he had nothing to lose, so he filled a jar with a urine sample and went to the drugstore. Finding the computer, he poured in the sample, and deposited the ten dollars. The computer started making some noises and various lights started flashing. After a brief pause, out popped a small slip of paper on which was printed:
You have tennis elbow
Soak you're arm in warm water
Avoid heavy labour
It will be better in two weeks
Late that evening while thinking how amazing this new technology was and how it would change medical science forever, he began to wonder if this machine could be fooled. He decided to give it a try.
He mixed together some tap water, a stool sample from his dog, and urine samples from his wife and daughter. To top it off, he jacked off into the concoction. He went back to the drug store, located the machine, poured the sample and deposited the ten dollars. The machine again made the usual noises and printed the following analyse:
Your tap water is to hard,
Get a water softener,
Your dog has worms,
Give him vitamins,
Your daughter is on drugs,
Put her in rehab,
Your wife's pregnant
It aint yours - Get a lawyer
And if you don't stop jerking off,
Your tennis elbow will never get better!