Elaborate, interactive marketing campaigns were launched in the months leading up to the release of this film. One of these was an event at the 2007 San Diego Comic-con called Why So Serious, which involved fans following clues hidden around the city. The legions of Joker-painted fans ended up congregating in the street across from the convention center, where one of their numbers was welcomed into a black Escalade (with Gotham license plates) that had just pulled up. After a moment the fan started screaming and the SUV sped away. Later that day, a Gotham City newspaper was circulated reporting that a man believed to be the Joker was found beaten to death. Included were crime scene photos of the fan who had gotten into the Escalade, and a mention that he was found with a playing card in his hand, on which was scribbled "See you in December."
I stole this from IMDB, but I thought it was really cool.
Thanks for the great giveaway!