After trying a new shampoo for the first time, Bill mailed 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 same company produced: soaps, detergents, tooth paste, and paper items... with a "thank you" note from the manufacturer.

"Well, What do you think?" asked his smiling wife, Sue.

"I think that next time," Bill replied. "I'm writing to General Motors."