Feedback Letter

After trying a new shampoo for the first time, this woman fired off an enthusiastic letter of approval to the manufacturer. Her husband laughed at her and said the letter will end up in a trash bin of some low level secretary.
Several weeks later she 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 say to that?” the wife asked smiling.
“Next time, you should write a letter to General Motors,” came a reply.