One day, in line at the company cafeteria, Joe 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
Woolworth's. Just give it a urine sample and the
computer will tell you what's wrong and what to do
about it. It takes ten seconds and costs five
dollars... A lot quicker than a doctor."
So Joe deposits a urine sample in a small jar and
takes it to Woolies. He deposits five 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.
Thank you for shopping @ Woolies."

That evening while thinking how amazing this new
technology was, Joe 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 a sperm sample for good measure.
Joe hurries back to Woolies, eager to check the
results. He deposits five dollars, pours in his
concoction, and awaits the results.
The computer prints the following:
1. Your tap water is too hard. Get a water softener.
(Aisle 9)
2. Your dog has ringworm. Bathe him with anti-fungal
shampoo. (Aisle 7)
3. Your daughter has a cocaine habit. Get her into
rehab.
4. Your wife is pregnant, Twins. They aren't yours.
Get a lawyer (1st Floor).
5. And if you don't stop playing with yourself, your
elbow will never get better.
Thank you for shopping @ Woolies