There was this nouveau riche blond girl, who went to the nearest Mercedes showroom with a pocketful of dollars, and came out with the latest model.
Half an hour later she was back at the showroom, claiming a that the car they sold her was terrible, that she was disappointed a brand-new Mercedes would get a fault in the gearbox after 15 minutes. The management apologized and gave her a new car.
Again, after half an hour she came back. The management offered her a new car, but sent along one of their engineers to see if they could figure out what the problem was. She put in the first gear... sped up... put in second... third... fourth... fifth.... And now, she said, for the rocket, and threw it in reverse.