Terrible acting, screenplay and direction.

If you don't like this, we can't be friends.

Did you people see the same film I saw?

Blistering performances.

Who was there? An incredibly generic serial killer, accompanied by a terrible script and performances that ranged from lackluster to terrible. A group of teens whom we saw for maybe five minutes at the beginning of the film (that, for the most part, don't show up again until their death sequence) are being killed off in a manner relating to their fathers' occupations. However, the big question isn't why this is happening, but do we as viewers even care given how little screen time the victims are given? The plot largely centers on one of the character's grandfather and a lady cop, although the token mentally disabled man-child gets an absurd amount of screen-time as well (whether or not he actually had contact with the killer is never established, yet he somehow knows the method people will be killed in).The story is largely incomprehensible. Due to extreme, unbuffered scene skips sometimes it's night, sometimes it's day, then it's night again all within mere minutes of film time. The fact that the film doesn't even attempt to establish something as basic as time is just one more example of the sloppy direction and script. Of course, the real kicker is when the killer's identity and motive is established there's something of a clear disparity between the killer's actions and the motive. How is this resolved? By a character claiming, "It makes sense", then choosing to not to elaborate on the batcrap logic of the bizarro world where it actually would make sense (as the motive has only the most tenuous of connections to the method, while not explaining at all why the kids are being targeted). Not to mention that the killer's apparent modus operandi, which involved only targeting a certain group of kids for a specific reason (and even letting somebody run off earlier for that reason), is abandoned at the end when he attacks a handful of non-involved personalities.However, films of this sort can occasionally overcome such flaws through the ability of its actors, a sense of humor, or some unique story element. Sadly, none of those was present. Although some character performances were at least tolerable for the most part (including "gramps" Ernest Mingione, who actually was pretty solid at times), the majority was strictly worse than other b-list productions. In particular, Kim Taggart (playing Detective Billie Vega) doesn't even seem to understand the concept of acting and often looks like she's reading the script right off a prompter. This sin might be forgivable if not for the fact she prominently features in most scenes, as a constant reminder of the film's numerous shortcomings. However, one of the more baffling decisions was for the granddaughter to keep a current photo of her grandpa in her room (which the camera seems to deliberately take note). Why a girl who wants no contact with her grandfather, going to the point of not even wanting to see the man, would keep a photo of him close to her (rather than say, one of her parents...) is yet another sloppy film-making mystery (presumably due to poor edits that removed a relevant scene along the way).All in all, I'd be very hard-pressed to name one single element that redeems the movie in some way. When it comes right down to it, Knock, Knock is a joke with no punchline.

In Glass County, several teenagers from high-school are slaughtered and their severed bodies are found in the working place of their fathers. The retired detective Mike (Antonio Mastrantonio), who is the absent grandfather that is trying to approach to his granddaughter Nikki Reynolds (Joli Julianna), teams up with the inexperienced Detective Billie Vega (Kim Taggart) to help her in her investigation, where the slow janitor Troy (Sal Sirchia) is the prime suspect.The lame "Knock Knock" is a terrible movie: the story and the screenplay are ridiculously bad; the unconvincing acting is awful; the camera work is dreadful. The only thing that works is the cover of the DVD that induced me to buy it. My vote is three.Title (Brazil): Not Available

I didn't even bother watching the end. It was pointless. This was a stereotypical teen slasher movie without anything new to add to the genre. In an effort to make up for a poor story and poor acting, the producers and directors give us a full serving of hot young bodies to stare at so that (they must hope) completely miss the fact that the movie is horrible. If all you are looking for is eye candy (and there is plenty of that) and lots of blood then this is probably the movie for you. Of course, you probably enjoyed zombie strippers as well. If you're looking for a GOOD horror movie that is suspenseful and scary, you've come to the wrong place.

In order to make this movie seem remotely watchable, I've added spoilers to the max, so if you don't want to know what happens you can stop reading now.This Knock Knock movie was seriously funny. The gore and killing were great, but the rest was just a very bad joke. The acting was horrendous. The starlets seem like strippers and the men look like the strip club owners. I'm not kidding. The men all speak with Brooklyn accents and look like mafia guys. The main detective was pretty ,but couldn't act herself out of a box. The story had some cool ideas. I'll mention those redeeming qualities.1. The beginning. Great 5 minutes of the movie. The guy knocks on the door and waits for the unsuspecting damsel to answer. He repeats this process 3 times and every time she opens the door , there is no one there. Finally she decides to catch the guy in the act by peeking through the peep hole, just as she does this, the killers' arm crashes through the door and grabs her. Even I jumped.2. The killings. Not only the gore, but also the way he props them for the parents to find. One girl is strapped to the shower and gutted. another is cut up into pieces and shoves into his Father's locker. There was no computer generated effects, so pretty good make up.3. This retarded janitor, who we meant to believe could be the killer , has all these Barbie dolls. He cuts off the faces off the students pictures and pastes them on to the dolls. Then he reenacts the murder seen, because fir some reason he always seems to be there, but he isn't the killer. If you have seen Maniac, you would appreciate this idea?These are the good parts. I would reedit this movie keep all those parts and cut out all the detective solving parts and especially the female detective and mafia fathers.I would probably add some more T&A and try to develop these characters at least to cardboard worthy personalities.Watch only if you like cool gory effects, otherwise...Fuggetaboutit.LOL!