Tallahassee, FL 2/6/12 (StreetBeat) -- General Motors (NYSE: GM) ignored a request from Ford Motor Co. (NYSE: F) and ran a humorous Chevrolet truck ad during the Super Bowl that takes a slap at Ford.The ad shows a group of men who have survived an world-destroying apocalypse, as supposedly predicted by an ancient Mayan calendar, because they all owned Chevrolet Silverado trucks. One asks about the fate of one of their friends.