The patient was berating the doctor for an extremely large medical bill not covered by his medical plan during a recent hospitalization.
"My dear fellow," said the doctor, "Let me assure you. If you only knew what a very interesting case yours was, and how strongly and often I was tempted to let it proceed to a post-mortem, you wouldn't complain at a bill three times that large."
A specialist is a doctor with a small practice and a very large house.