One day, in line at the works cafeteria, Jack says to Mike behind him, "My elbow hurts like hell. I suppose I'd better see a doctor." "Listen, don't waste your time down at the surgery," Mike replies. "There's a diagnostic computer at Asda. 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 only costs five pounds.....a lot quicker and better than a doctor". So Jack collects a urine sample in a small jar and takes it to Asda. He deposits five pounds and the computer lights up and asks for the urine sample. He pours the