Harry, a TV repairman, was called to fix a television set that had neither sound nor picture. Left alone in the room, Harry spotted the cause immediately: the set was unplugged. Harry faced a dilemma: one part of him said he shouldn't charge the woman; the other insisted he be paid for his time.
Finally, he presented her with a minimum-charge service bill, which read: "Restored isolated connecting cable to primary power source. $25."