Romantic comedies. Just saying those two words can make people squinch their face in disgust. They're formulaic, sophomoric and predictable. But every once in a while, a great one comes around. It's been happening since the dawn of cinema. "It Happened One Night," "Some Like It Hot," and more recently, "As Good As It Gets." The new romantic comedy starring Jennifer Lawrence, "Silver Linings Playbook," can be added to that list of outstanding movies.