After weeks of tweeting and hinting at an actual trailer, the official trailer for Batman: The Killing Joke has been released.  For those who have not read the graphic novel before, The Killing Joke is one of the darkest a most well-written of the Batman comics.   First off and most impressive, the movie is rated R, which is quite fitting considering the quite graphic nature of the subject matter.  Secondly, Batman is voiced by Kevin Conroy and the Joker by Mark Hamil, which for anyone who knows are the definitive voices for each of the characters.  Beyond that, the film definitely looks like a worthy adaptation of the comic.  View for yourself below: