First Joker trailer has a gritty, dark tone

Arthur, does it help there's someone to talk to? [MUSIC] My mother always tells me to smile, and put on a happy face. [MUSIC] She told me I had a purpose. To bring laughter and joy to the world. Is it just me? Or is it getting crazier out there. [MUSIC] [MUSIC] What? [LAUGH] [MUSIC] [LAUGH] What's so funny? [SOUND] Fleach [LAUGH] [MUSIC] Got him locked this way, what kind coward would do something Cold blooded. Someone who hides behind a mask. [MUSIC] I used to think that my life was a tragedy. [MUSIC] But now I realize, [MUSIC] it's a comedy. [MUSIC] [MUSIC] If you just smile. [MUSIC]