Four years before The Woman in Black, this year’s fake-scare fest for Harry Potter– loving tweens, James Watkins delivered a deadly punch to the gut with a directorial debut that was strictly for adults. At first glance a run-of-the-mill horror-in-the-wilds outing, Eden Lake soon blows its competition out of the water thanks to its sheer unflinching grisliness, as a couple who go camping in search of romantic tranquility are instead terrorized by a gang of chillingly sadistic teens. It’s a trip the lovebirds may not live to remember and audiences will not easily forget. (An early screen performance by Michael Fassbender is an added bonus.)