What makes an Effective Ad?

With the Superbowl just coming around the corner, not only are people excited about the Giants vs. The Patriots, but also what are going to be the big commercials of 2008? The commercials of the Superbowl have become almost as popular as the game itself. With adds costing millions of dollars the question is what makes an effective add. This is an older Superbowl add (WAZZUP) by Budweiser that was so popular it became an integrated part of our society. The question is why? Is it because of the humor, is it because Budweiser is so delicious, or is it brilliant targeting and segmenting on the behalf of the marketing team at Budweiser?