It's not fun following teenage kid Clark (Ben Konigsberg) around for an hour and a half. Clark is the lead character in Noah Pritzker's debut feature "Quitters" (Pritzker co-wrote the script with Ben Tarnoff), and he is manipulative, passive-aggressive, and a user with zero sense of humor. Teenagers are often annoying, of course. And teenage angst and peer pressure and the newness of some experiences make them all act a little nuts. But Clark is a horse of a different color. Konigsberg, to his credit, does not soft-pedal any of Clark's personality flaws, a remarkable accomplishment for such a young actor. But, still, "Quitters" is a challenging and joyless experience. The title of the film is accurate. Everyone here quits: on themselves, on situations, doing drugs, staying in relationships. Considering his selfish parents, it's no wonder Clark has made an art out of bailing (often with great cruelty) when things get tough.