A doctor and lawyer were chatting at a party. The doctor was constantly interrupted by people describing ailments and asking for free medical advice. After an hour, the exasperated doctor asked the lawyer, “What do you do to stop people asking for legal advice when you’re relaxing?”

“I give it to them and send a bill the next day.” The doctor was shocked, but said he’d give it a try. The next day the doctor prepared bills for those who’d ruined his night out.

When he emptied his mailbox, he found a bill from the lawyer.