A doctor and a lawyer were attending a cocktail party, where the doctor was approached by a man for some advice on how to handle his ulcer. The doctor advised him to get admitted to his clinic for a surgery. Then the doctor turned to the lawyer...

Doctor: Well, how do you handle such a situation, when you are asked for advice at a social gathering?

Lawyer: Just send a bill for the advice.

Next morning, the doctor went to his clinic and issued the ulcer-stricken man a $50 bill. In the afternoon the doctor received a $100 bill from the lawyer.