During a party, a doctor was talking to a lawyer about how he was tired of his friends asking him for free medical advice.
The lawyer said, “I used to have that problem, but not anymore.”
Intrigued, the doctor asked, “Oh really? How?”
The lawyer replied, “Just do what I do when they solicit you for advice. Mail them a bill.”
This was an amazing revelation to the doctor, and he decided to try it next time it happened.
Two days later the doctor received the lawyer’s bill.