One day, in line at the company cafeteria, Bob says to Mike behind him, 'My elbow  hurts like the dickens!! I guess I'd 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 will tell you what's
wrong and what to do about  it.

It takes ten seconds and costs $10 - A lot cheaper than a  doctor.'

So, Bob deposits a urine sample in a small jar and takes it to Wal-Mart.

He deposits $10, and the computer lights up and asks for the urine sample. He pours the  sample into the slot and  waits. 

10 seconds later, the computer ejects a printout:
'You have tennis elbow. Soak your arm in warm water and Epsom salts found on aisle 2. Avoid heavy  activity. It will improve in 2 weeks. Thank you for shopping @ Wal-Mart.'

That evening, while thinking how amazing this new technology was, Bob 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 sp*rm sample for good measure.

Bob hurries back to Wal-Mart, eager to check the results. He deposits $10, 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.

5. If you don't stop playing  with yourself, your
elbow will never get  better!