A doctor and a lawyer were chatting at a party. Their chat was constantly interrupted by guests describing their ailments and asking the doc for medical advise. After an hour of this, the exasperated doc asked the shyster how he stops people from asking free legal advice.

“I give it to them,” replied the lawyer, “and then send them a bill.”

The doc was shocked but gave it a try.

The next day, feeling guilty, the doc made the bills.

When he placed them in his mailbox, he found a bill from the lawyer.