Wake in Fright (1971)

Wake in Fright is the story of John Grant, a bonded teacher who arrives in the rough outback mining town of Bundanyabba planning to stay overnight before catching the plane to Sydney. But his one night stretches to five and he plunges headlong toward his own destruction. When the alcohol-induced mist lifts, the educated John Grant is no more. Instead there is a self-loathing man in a desolate wasteland, dirty, red-eyed, sitting against a tree and looking at a rifle with one bullet left...