A mainframe computer on which everyone in the office depended suddenly went down. They tried everything but it still wouldn't work.
Finally they decided to call in a high-powered computer consultant. He arrived, looked at the computer, took out a small hammer and tapped it on the side.
Instantly the computer leapt into life.
Two days later the office manager received a bill from the consultant for $1000. Immediately he called the consultant and said, "One thousand dollars for fixing that computer? You were only here five minutes! I want the bill itemized!"
The next day the new bill arrived.
It read, "Tapping computer with hammer: one dollar. Knowing where to tap: 999 dollars."
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