But it’s the scene that changes the story. In the film American Beauty (1999), the moment Lester Burnham quits his job, walks out of his cubicle with a beer in hand—that’s it. That’s his turning point ...

Leads may carry the story, but sometimes it's the supporting characters who own it. They swoop into the frame, drop a line or a look that clings to your brain, and suddenly, the film doesn't feel like ...