i be afraid i learn nothing from this movie . it isn not a smart satire on the detach upper middle class and how they put up a gate between themselves and the violent world outside . it isn not a dark comedy of manner . it really just a slow paced slasher movie promoting and celebrate mindless violence for entertainment . it have about as much social significance a i know what you do last summer . i particularly despise the use of kill a child for nothing more than shock value . if you be distract by the art house aesthetic and use of cinematic and audio editing technique and do not agree then i would like to present the classic horror or slasher or suspense scenario for your consideration . spoiler represent one of the victim escape the clutch of the psycho and run into the desert neighbourhood only to flag down a vehicle drive by yes you guess it and one of the psycho who bring her straight back to the house where she be originally imprison . it play a little differently a he isn not the driver of the first car she see but it the same tired old trite cliché you have see before so many time . a for the excruciatingly predictable end and i really could have write the last line myself half way through the movie and ( seal in in an envelope and post it to myself and it would have be deliver before the end of the movie which felt like forever in arrive ) . and it have one of those ending that you think to yourself be that be . and unfortunately that be it . a movie about two motiveless two dimensional psycho killer with no explanation or conclusion to satisfy the viewer . it address the issue of violence and it affect on an ineffectual society just about as much a the late rambo movie do . it seek to do so and aim but miss by a mile . just glossy violence and nothing more .