In the midst of a depression or any emotional mean season, the bitterest pill is sometimes not the suffering itself, but the realization that what you're feeling is actually quite ordinary. You might like to think that you're hurting as few humans have before, that your angst is the result of seeing stupidity or ugliness in the world to which others are blithely unware. But really, it pains you to realize, you're just swimming upstream in the same chemical tide that might be battering lots of people around you at any given time. Roger Greenberg (Ben Stiller) is plagued by no such self-awareness. He writes angry letters to Starbucks, American Airlines, even Mayor Bloomberg in New York City as if he's the first person who ever thought of doing so, as if the dark or just annoying forces of the universe have been marshalled against him specifically. He seems a slightly less sane successor to the bitter, deluded father played by Jeff Da...