Letter of Approval

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 (纸板箱)in the middle of the floor. Inside were free
samples of the many products the company produced: soaps, detergents
(清洁剂), tooth paste, and paper items.

"Well, what do you think" his wife asked smiling.

"Next time," he replied.  "I'm writing to General Motors