One day, in line at the company cafeteria, Jack says
to Mike behind him,

"My elbow hurts like hell. I guess I better see a
doctor." "Listen, you don't have to spend that kind of
money," Mike replies.
"There's a diagnostic computer down at Wal-Mart. Just
give it a urine sample and the computer'll tell you
what's wrong and what to do about it.
It takes ten seconds and costs ten dollars...a hell of
a lot cheaper than a doctor."
So Jack deposits a urine sample in a small jar and
takes it to Wal-Mart.
He deposits ten dollars, and the computer lights up
and asks for the urine sample.
He pours the sample into the slot and waits.
Ten seconds later, the computer ejects a printout: You
have tennis elbow. Soak your arm in warm water and
avoid heavy activity. It will improve in two weeks.
That evening while thinking how amazing this new
technology was, Jack began wondering if the computer
could be fooled. He mixed some tap water, a stool
sample from his dog, urine samples from his wife and daughter,and
masturbated into the mixture for good measure.
Jack hurries back to Wal-Mart, eager to check the results.
He deposits ten dollars, pours in his concoction, and
awaits the results.
Thecomputer prints the following:
1. Your tap water is too hard. Get a water softener.
2. Your dog has ringworm. Bathe him with anti-fungal
shampoo.
3. Your daughter has a cocaine habit. Get her into rehab.
4. Your wife is pregnant...twin girls. They aren't
yours. Get a lawyer.
5. If you don't stop playing with yourself, your elbow
will never get better.