In this pivotal scene of Christopher Nolan's The Dark Knight we are finally introduced to how the Joker sees this world and Batman's role in it.
In starting the scene with the Joker upside down and flipping the camera around to his point of view Wally Pfister (frequent Nolan collaborator and TDK cinematographer) lets the audience in on the master plan. While seemingly defeated and in Batman's clutches, the Joker wins. Gotham, as they know it, will never be the same.