Wonderful coffee
Customer to waiter: Everyday you charge me money for a cup of coffee. It will be wonderful if you serve me coffee free of cost today.
Waiter: Sir, everyday you drink coffee from a filled cup. It will be wonderful if you drink it from an empty cup today.

Doctor's promise
"Doctor, are you sure I'm suffering from pneumonia? I've heard once about a doctor treating someone with pneumonia and finally he died of typhus."
"Don't worry, it won't happen to you. If I treat someone with pneumonia he will die of pneumonia only."

Dentist's thinking
Patient: "It must be tough spending all day with your hands in someone's mouth."
Dentist: "I just think of it as having my hands in their wallet."

In safe hands
Patient: Doctor I heard 10 percent of the total patients undergoing this surgery die.
Doctor: Don't worry man, those 10 percent patients operated by me are already dead. Now it's the turn of the 90 percent survivors.