Being Paid For Advice
At a party, a doctor is commiserating with a lawyer.
He says that wherever he goes people ask him for medical advice.
The lawyer agrees and says he has the same problem - people are always asking him for legal advice.
The doctor asks him how he deals with it, and the lawyer says that it's simple - he sends the person a bill and pretty soon the word gets around and it stops.
Next morning the doctor gets a bill from the lawyer.