Will Joker ironically be the least funny movie in the DC Extended Universe? It sure seems that way after the first teaser trailer for the dark, twisted standalone movie debuted on Wednesday. The two-and-a-halfminute preview introduces star Joaquin Phoenix as the title character's alter ego, Arthur Fleck, a dejected man who tries to find work (and joy) as a clown before spiraling downward into the life of a manic criminal. Phoenix's stunning performance comes across as even creepier thanks to a score that includes Nat King Cole’s "Smile." Joker, which was directed by Todd Phillips and co-stars Robert De Niro, arrives in theaters on October 4.