It is a dark and stormy night. Rain pelts the pitch black trailer park. A leashed pit bull barks as the stranger approaches. He beats on the trailer door. The woman who opens the door is naked... full frontal. It's his step-mother.
In a summer of movies made of bombastic special effects and obvious action, Killer Joe still has the ability to surprise by keeping it down and dirty -- though you'll need a strong stomach to make it to the end.