Apparently Ford was peeved at the Chevy super bowl ad, where all the survivors of the apocalypse predicted by the Mayan calendar meet up before frogs start raining from the sky, and notice they're missing one person from their pickup-truck posse. The older guy in the gang then responds with a line which sounds like he's reading straight from the brief: "Dave didn't drive the longest-lasting, most-dependable full-size pickup truck on the road" and ends with "Dave drove a Ford".

According to WSJ Chevrolet said it received a letter yesterday from longtime rival Ford Motor Co. asking that it not show its Super Bowl commercial for the Chevy Silverado pickup.

“Woke today with letter from Ford asking Chevy to pull 2012 Super Bowl ad. Really! We stand by our longest-lasting most dependable truck,” said GM marketing boss Joel Ewanick in an email today.
In an earlier statement Ewanick said the ad is “a fun way” of putting the company’s claims about the Silverado in the context of the apocalypse. The company said it won’t pull the commercial, which is set to run during the first quarter of today’s game.
“We can wait until the world ends, and if we need to, we will apologize,” Ewanick added.

The ad will still air. Listen carefully to see if they dubbed "Ford" to something else.