Lol, sounds like the hammer story. (Original is ship engine)
A business owner is horrified to discover one morning that her company?s server is broken. Won?t boot up, won?t turn on. She calls a computer repair expert to come out and see what he can do.
The expert shows up, looks at the machine carefully, and even gives it a careful listen. He runs his fingers lightly on the side of the computer, and then taps it with a small hammer. The computer starts right up, the business owner is happy, and the expert goes away.
Two days later, the expert?s bill shows up. ?Computer repair, $500,? it says.
The business owner calls up the expert, angry. ?$500?! All you did was tap the computer, and you charged me $500?! I need to see an itemized version of your bill, to see why you thought that was worth $500.?
Two days later, the new bill arrives in the mail. ?Tapping the computer with a hammer, $1. Knowing where to tap it, $499.?