Hah! I remember that scene! I remember when I was in the theatre, I had this funny feeling of dejavu when I saw the Joker falling off the building just before Batman caught him from falling to his death. Because the first thing I remembered was the scene from the 1989 film where Batman kills the Joker by tying his leg to a stone statue which caused him to lose his grip on the ladder and we watched him fall to his death. But the Dark Knight had a twist of events. The Joker just gets caught. And then he utters his last best lines just before we get to the end with Two Face. The Dark Knight was a great movie. I loved it. Though it's ashame we won't be seeing Heath Ledger reprise his role as the Joker since he's dead now. *sigh*
Rest in peace, Ledger. You were the best. And we the fans miss you dearly.