The Los Angeles of “Crash” is segregated and inflamed. Persian, African-American, Salvadoran-Puerto Rican and White people collide violently with one another via carjackings, service interactions, a little sex, and most of all, car crashes. Having found themselves outside their bubbles, they do what we all do in unfamiliar company: deliver candid, racist sermons about the prejudices they hold to be self-evident.