Bob complained to his friend "My elbow really hurts. I guess I should
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. It only costs $10.00."

Bob figured he had nothing to lose, so he filled a jar with a urine
sample and went to the drug store. Finding the computer, he poured in
the sample and deposited the $10.00. The computer started making some
noises and the various lights started flashing. After a brief pause
out popped a small slip of paper on which was printed:
You have tennis elbow
Soak your arm in warm water.
Avoid heavy labor
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 masturbated into the
concoction. He went back to the drug store, located the machine,
poured in the sample and deposited the $10.00. The machine again made
the usual noise and printed out the following analysis:
Your tap water is too hard
Get a water softener.
Your dog has worms
Give him vitamins.
Your daughter's on drugs,
Put her in rehab.
Your wife's pregnant
It ain't yours---get a lawyer.
And if you don't stop jerking off,
Your tennis elbow will never get better.