For moviegoers, dark films raise a basic question: Why subject yourself to death, devastation and anguish when you can see "Elf" instead? The essential problem may be as simple -- and as complicated -- as the economic structure of the movie business itself. I'll try the straightforward approach: forget "Elf" and go see "21 Grams." How to Spread the Word When the Word Is 'Grim' | 
