Explain the film Crash.

Crash explores racial and social tensions in Los Angeles—and by extension, America—through a story that follows a dozen characters through the use of interlocking narratives. It starts with a car accident (hence the title), then works backward, via flashbacks, to reveal how the lives of all involved in the collision, including police personnel called to the scene, intersect in various ways.
Within this context, the movie makes statements on relationships between police and citizens, races and classes, and rich and poor. It raises questions with complicated answers, avoiding traditional racial and economic stereotypes. For example, in one scene a white police officer pulls over an upper-class black couple and blatantly gropes the wife as he searches her. This creates tension not only between the wife and her husband, who urges her not to make waves, but also between the wife and white authority. Later, as fate would have it, the wife is in an accident and trapped beneath her car, which is about to explode. The same white police officer is first on the scene and the only one who can save her, if she will let him pull her out.
Crash is peppered with ironic moments like this, forcing viewers to confront their own prejudices on issues of race and class. The movie won 2004 Oscars for best picture, best original screen play, and best film editing, and it was nominated for Academy Awards in three other categories.