One day, in line at the company cafeteria, Joe says to Mike, "My elbow hurts like crazy. 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 will tell you what's wrong and what to do about it. It takes ten seconds and costs ten dollars... a lot cheaper than a doctor."
  
So Joe puts 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. Thank you for shopping at Wal-Mart."
  
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 hurried back to Wal-Mart, eager to check the results.
  
He deposited ten dollars, poured in his concoction, and awaited the results.  The computer then 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.
  
Thank you for shopping at Wal-Mart