These are one of the funniest kind of jokes because the Medical profession is otherwise a serious profession.
An eminent doctor goes for a meal in a gourmet restaurant.

As he is inspecting the menu, the head waiter appears and tries to be particularly helpful.

"You might be interested to know that I have pickled liver, braised kidneys and stewed tongue."

"Sounds terrible," says the doctor. "Call my assistant and make an appointment for tomorrow. Right now, I'll have the fish."