A man visited several automobile repair shops and spent lots of money with no luck. He finally took his car to a mechanic who was known not known to be the cheapest. Within a few minutes and a couple of taps with a hammer the car was fixed and the bill delivered. Outraged at the amount of time spent and the bill, the man confronted the shop owner. The shop owner just smiled and said, “It matters not how many times and for how long I tapped the engine. It matters that I knew where to tap it.”