Jon Martello (Joseph Gordon-Levitt) takes aim at the romantic comedy genre in the latest trailer for Don Jon. While he chides the rom-com movies for being unrealistic and predictable, Jon has an unhealthy obsession with Internet pornography, even while he's with his new girl Barbara Sugarman (Scarlett Johansson), who herself was raised on the sappy Hollywood romances that Jon despises. Watch what happens when two opposites attract in the latest footage from Joseph Gordon-Levitt's directorial debut, in theaters September 27.