GM is airing three 60-second spots for Chevy on the Super Bowl. We had already seen two of them —"Stunt Anthem" for the Sonic, and the "Happy Grad" consumer-generated ad for the Camaro (which drags a bit compared to the :30, but apparently GM didn't think so). This morning, GM unveiled the third Chevy :60 for the game—an end-of-the-world spot by Goodby, Silverstein & Partners for the Silverado in which the Mayan apocalypse, scheduled for this year, has happened, and only Chevy truck owners have survived. (Ford owners never stood a chance.) The spot is a bit reminiscent of Goodby's old E*Trade ad  from a decade ago, with the monkey wandering around the post-dot-com-bubble wasteland. Twinkies make a humorous appearance at the end of the Silverado spot—cockroach-like in their ability to withstand the apocalypse. The damn box doesn't even have any dust on it. Hostess should feel insulted, but they'll take what they can get at this point.