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. When he went to
place them in his mailbox, he found a bill from
the lawyer.