When a wealthy businessman choked on a sharp fish bone in a restaurant, he was fortunate that a doctor was seated at a nearby table. Springing into action, the doctor skilfully removed the bone and saved the businessman's life.

Recovering slowly, he thanked the doctor profusely and offered to pay him. "Just name your fee," he croaked gratefully.

The doctor thought for a moment and said: Okay. "How about half of what you would have offered when the bone was still stuck in your throat?"