I watched this movie a little over a year ago, and my first bit of advice is don't eat while watching the movie or if you do eat, you better eat pretty bloody fast or you'll puke it up lickitysplit. The movie is stock full of disgusting and gorey scenes all in their glistening glory. This movie is not for the squeamish.
So the story starts out with this totally lame pansy who works in an insurance company. His girlfriend is very whiny and irritating, and makes me want to beat both up with a spiked bat (the antagonist does a good job of doing this by him/herself). One day, he gets a case where a little boy is hung to death. The "parents" (I put that in quotes because they're only technically so) are trying to get a claim for some money. Due to some misplaced self-righteousness, the idiotic protagonist tries to get to the heart of this when he should have left it to the police, because the situation OBVIOUSLY didn't reek of bloody DANGER.
That being said, the antagonist is very freaky and will put a new meaning to the word "psycho". The acting is well done, the music and sounds added to the atmosphere (though it was already clogged up by a mist of blood), and the story is pretty decent with some pretty predictable plot turns.
(ANIMALS WILL DIE, BTW. If you're a rabid animal lover, please turn away immediately.)
By the end of the movie, you will be terrified of going home to your own house and putting the trash out. You'll understand if you watch the movie.