An expensive machine breaks down in a big factory putting hundreds of employees out of work and costing the employer tens of thousands of dollars a day in lost revenues. After two weeks of hiring the top mechanics in the industry only to find nobody who could fix it, the employer, in desperation, puts out an add in the classifieds.
The next day, an old man with a little black bag shows up. "Who the hell are you," asks the employer? "I responded to your classified, I'm here to fix your machine," the old man answers. Totally unimpressed, yet desperate, the employer directs the old man to the machine.
The old man looks at it. Then he goes to the back and removes a back panel and looks inside. Then he takes a hammer out of the bag and sticks his head and upper body deep into the machine. Then the employer hears, "ding," and the machine roars right up. The employer is amazed! "Do you know how many mechanics I had here before you, who couldn't fix it," says the employer? "You're the best mechanic ever! How much do I owe you?" The old man replies, "$1000." The employer says, "$1000? All you did was hit it with a hammer!" The old man replies, "$1 for hitting it with the hammer. $999 for knowing where to hit."