Snow Cake is a 2006 independent drama starring Alan Rickman and Sigourney Weaver. Shortly after Rickman's character picks up a young hitch-hiker, he is in a sudden, brutal accident and the girl is killed. Paralyzed by guilt, he tries to reconcile with the girl's mother, portrayed by Sigourney Weaver, who happens to be autistic.
That is an intriguing premise. Too bad the film is stunngingly, bafflingly awful.