Sunday's best Super Bowl commercial wasn't, in the strictest sense of the word, a commercial at all but a promo for CBS, which broadcast the game.

It was a brief spot for The Late Show With David Letterman in which Letterman, looking crankier than usual, takes a bite of a chip and mutters, "This is the worst Super Bowl party ever." The camera pulls back to reveal that Letterman is sitting next to Oprah Winfrey, a frequent target of his barbs. "Be nice, Dave." Winfrey says, and then the camera pulls back more to reveal Jay Leno, whom Letterman has enjoyed dumping on for years, but especially recently, in light of NBC's late-night chaos. "He's just saying that because I'm here," Leno says resignedly.

That NBC's Leno, or at least a very convincing version of him, would appear on a rival show's spot indicates that there's some evil and very persuasive genius working at CBS' promotions department. The network came up with the funniest spot on a night when the actual commercials -- the ones that cost advertisers a reported $2.5 million to $3 million for 30 seconds of air time -- were overall a disappointment.

Most of the ads don't seem likely to generate much water-cooler talk today. Exceptions could include the Kia Sorrento ad in which some retro toys in the back seat fantasize that they're out for a night in Vegas; Boost Mobile's "Shuffle" ad, a takeoff on the 1985 Chicago Bears Super Bowl Shuffle that proves that former Bears QB Jim McMahon is still a lousy rapper; and an elaborate Coca-Cola ad featuring the entire cast of The Simpsons.

Focus on the Family's anti-abortion ad featuring Heisman Trophy winner Tim Tebow and his mom, Pam, generated water-cooler chat before it aired. And the group's ad that ran during the game wasn't strident, unless you count the part where Tebow tackled his mom. MORE and Video Below