River's Edge
I would ramble on about how this film points up a fundamental moral breakdown in our society, but that is not important. No self-righteous indignation matters in the face of actual, crushing death.
What do the people in your life mean to you? Who are you loyal to? What is the basis of your morality? Get your nunchuks and your dad's car. I know where we can get a gun.
Extra credit for this film predating the work of both David Lynch and Gus Van Sant; This is the most Twin Peaks movie I’ve ever seen, I had to check the year it was released multiple times.