A lawyer and a doctor are at a cocktail party. A person comes up to the doctor and asks about a symptom he's been having lately. The Dr. gives him some advice and turns to the lawyer. "It's always awkward when people ask me for my professional opinion in a casual setting. Do you think it's ok if I charge them?" "Absolutely" says the lawyer. "I think it's perfectly fine." The following week the doctor gets a bill from the attorney.