A doctor and a lawyer were talking at a party. Their conversation was constantly interrupted by people describing their ailments and asking the doctor for free medical advice. After an hour of this, the exasperated doctor asked the lawyer: “What do you do to stop people from asking you for legal advice when you’re out of the office?”
“I give it to them,” replied the lawyer, “and then I send them a bill.”
The doctor was shocked, but agreed to give it a try. The next day, still feeling slightly guilty, the doctor prepared the bills. But, when he went to place them in his mailbox, all he found was a bill from the lawyer.