Given the speediness of the Warner Bros. lawyers, we don't expect this'll stay online for long, but the first six minutes of Batman Begins sequel, The Dark Knight — which are currently showing before Imax screenings of I Am Legend — have leaked to YouTube. In the clip, we're introduced to Heath Ledger's Joker, who manages to commit at least ten felonies (that we can count) before Batman is even alerted. Needless to say, the movie looks totally awesome. Should Batman's attorneys send YouTube a take-down notice before you get a chance to watch, all is not lost — check out the movie's official trailer in high-quality here. It, too, makes The Dark Knight look awesome.

Update: Look at that — down already! Nice work lawyers!

The Dark Knight Prologue Leaked Online [/Film]
The Dark Knight trailer [A Taste for the Theatrical]