The Art of Selling
There is a story about a boiler specialist. He was hired to repair a huge steamer boiling system. Singing some song into his beard, he opened his brief case and took out a small hammer. Then he struck with it just once on some red valve. Instantly the whole system started working smoothly and the worker went home. The next day the owner of the steamer got a $ 1000 receipt and he started complaining as the specialist was in the machinery department only for 15 minutes.