Jake Gyllenhaal in JarheadJARHEAD

In movies, nothing is harder to define than tone, and the tone of Sam Mendes' Jarhead, based on Tony Swofford's Gulf War memoir, is so elusive that, hours after it ends, you might still not know what to make of it. In many ways, the movie is like a two-hour expansion of Full Metal Jacket's first 40 minutes, as the 20-year-old Swofford (Jake Gyllenhaal) and his fellow Marine recruits, pumped up to an almost insane degree, train for their mission in the unbearable desert heat and prepare for battle. In Mendes' film, however, there is no battle for his protagonists to respond to; the war ends while the Marines' bloodlust is still reaching a boil. The film is, in many ways, about the maddening banality of service, and it has resulted in an occasionally maddening movie, but its shifting tones and air of unpredictability make it impossible to shake off; at the finale, you might not know exactly what you've seen, but you certainly know you've seen something.

Jennifer Esposito, Don Cheadle, and Kathleen York in CrashCRASH

Crash, the magnificent drama by Million Dollar Baby screenwriter Paul Haggis, fits alongside such sprawling, ensemble-driven works as Grand Canyon, Short Cuts, and Magnolia, movies in which plotlines dovetail within one another and themes enmesh, and where bitter, dissatisfied characters might not wind up more content than before - some might not even wind up alive - but they will definitely have shared, for better or worse, An Experience. (These characters might not receive traditional happy endings, yet they almost invariably find degrees of solace and a measure of hope.) Moviegoers who crave a clearly delineated moral to their stories can be driven batty by films of this ilk; more than once I've heard someone ask, apropos of one of these works, "But what was its point?" Crash, like its predecessors, explores characters so hungry for contact and meaning and understanding in a chaotic universe that they're ready to explode, and oftentimes do. That hunger becomes the point.

Ben Stiller and Jennifer Aniston in Along Came PollyALONG CAME POLLY

There's a pretty funny movie lurking within Along Came Polly, but unfortunately, it bears little relation to the slack and obvious one Ben Stiller and Jennifer Aniston are stuck in.