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Would you please do me a favour?
A dentist, after completing work on a patient, came to him begging.
Dentist: Could you help me? Could you give out a few of your loudest, most painful screams?
Patient: Why? Doctor, it wasn't all that bad this time.
Dentist: There are so many people in the waiting room right now, and I don't want to miss the four o'clock ball game.