One shot of Good Sam features Gary Cooper standing in the middle of two women. One cries in misery while the other laughs her head off, and they seem about equally at the edge of delirium. This moment defines the whole movie, which balances comedy, pathos, and irony so freely within each scene that you don’t know how the movie expects you to react. This ambiguity of affect marks the cinema of Leo McCarey. He’s so fascinated by observing the nuances of human reactions, and how the emotions of different characters feed and counterpoint each other, that he lets scenes run on quite long; you get the feeling he’d just as soon they never end. Were he active but few decades later, he might have been John Cassavetes.