“Why So Serious?” was a 360 alternate reality experience - deep, pervasive, interactive, and viral. Centered on the web, yet branching out over mobile, mail, flash mobs, scavenger hunts, casual games, user generated content, collaborative narratives, streaming video and more, the audience was immersed into the saga of Gotham City from the last frame of Batman Begins to the opening scene of The Dark Knight. Over 10M unique participants in 75 countries made “Why So Serious?” a new benchmark for integrated campaigns. The Dark Knight was the most successful movie of 2008 and 2nd highest grossing film of all time.