Parody is often the sincerest form of appreciation, especially in the sections of Poison  labeled (in the end credits) “Hero” and “Horror.” The former takes on the true-crime documentary to tell the story of a boy who kills his father and then disappears; the latter smartly adopts the look and feel of old black-and-white horror movies in its account of a scientist’s experiment gone awry. The third segment, “Homo,” is less parodic in nature, although it draws elements from prison movies to tell its story of an inmate’s obsession with another man whom he had known in a previous incarceration. If you’re used to the finesse Todd Haynes brings to his later films with big budgets and major stars, such as Far From Heaven (2002) and Carol (2015), the roughness of Poison may be a shock. But it’s still a compelling and often disturbing movie.