After trying a new shampoo for the first time, a guy fired off an enthusiastic letter of approval to the manufacturer. Several weeks later he came home from work to a large carton in the middle of the floor. Inside were free samples of the many products the company produced: soaps, detergents, tooth paste, and paper items. "Well, what do you think" his wife asked smiling. "Next time," he replied. "I'm writing to General Motors!"