As the final scene cut to black and the end credits appeared, accompanied by the ridiculous “Strokin'” by Clarence Carter, Killer Joe made me laugh harder than anything I saw last year, which is quite an accomplishment given that a more reasonable (not to mention easily defensible) response to its most over-the-top moments would be to recoil in disgust. If the film didn’t read in part as a knowing and deliberate parody of the literature of the American poverty belt — think of it as a demented three-way involving Tennessee Williams, William Faulkner, and Jim Thompson — I’d likely find it psychotic.