21 Grams

The movie interweaves several plot lines, around the consequences of a tragic automobile accident. Penn plays a critically ill academic mathematician, Watts plays a grief-stricken mother, and del Toro plays an born-again Christian ex-convict whose faith is sorely tested in the aftermath of the accident.
The 'R' Rated movie is presented in a non-linear arrangement where the lives of the characters are depicted before and after the accident. The three main characters each have 'past', 'present' and 'future' story threads, which are shown as non-linear fragments that punctuate elements of the overall story, all imminently coming toward each other and coalescing as the story progresses. (wikipedia)

Like few films in recent memory, 21 Grams fully reveals what it is to be human in the clutches of life's most challenging moments (IMDB).