One day, in line at the company cafeteria, Joe says to Mike behind him, 'My elbow hurts like hell. 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 ten dollars . . A lot cheaper t han a doctor !

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