A doctor and a lawyer were attending a cocktail party when the doctor was approached by a man who asked him how to handle his ulcer. The doctor mumbled some medical advice, then turned to the lawyer and asked: "How do you handle the situation when you're asked for free advice during a social function?" "I just write up a bill and send it off in the mail afterward," replied the lawyer. The next morning the doctor arrived at his surgery and wrote a $50 bill for the ulcer-stricken man. That afternoon he received a $100 account from the lawyer.