These are moments of grace. They are moments when the reality becomes clear that "self-made" can only go so far, that we can never truly survive on our own, and that that's a good thing. We need grace. And while grace cannot be earned and must accepted from a humble posture, grace is not opposed to effort, as Dallas Willard says.
Indeed, one of the most graceful things about grace is that it doesn't belittle our efforts. God created us to work, to strive, to carry Adam's torch of not merely surviving but cultivating a world that flourishes in the way it was meant to. Men want to "fix" things, to bring order out of chaos; it's only when these desires becomes fodder for pride and "I don't need God!" self-sufficiency that they become problematic.
Both Locke and All is Lost (and even Gravity, for that matter) explore the intersection of human effort and supernatural grace. Each explores the ingenuity of mankind in bringing order out of chaos, surviving a harsh world through God-given creativity and endurance. And yet each highlights man's limitation too: his inability to save himself. In the final upward glance ("thank you") of Gravity, the downward reach of rescue in All is Lost, and the cry of new life at the end of Locke, we see the necessity and beauty of salvation from outside the self.
Locke is rated R entirely because of strong language, which is used throughout the film, though not in a gratuitous way. The film's serious plot lines include mention of infidelity and a woman in a hospital who has to undergo an Caesarean section, though we don't seen any of it.
Brett McCracken is a Los Angeles-based writer and journalist, and author of the books Hipster Christianity: When Church and Cool Collide (Baker, 2010) and Gray Matters: Navigating the Space Between Legalism and Liberty(Baker, 2013). You can follow him @brettmccracken.