A doctor and a lawyer were talking at a party, but their conversation was constantly interrupted by people describing their ailments and asking the doctor free medical advice. After an hour of this, the exasperated doctor asked the lawyer: "What do you do to stop people asking you for legal advice when you're out of the office?" The lawyer said: " I give it to them and then I send them a bill." Although shocked by this, the doctor agreed to give it a try. The next day the doctor, acting on the lawyer's suggestion, was reluctantly putting a number of bills into his mailbox when he found a bill addressed to him. It was from the lawyer.