What a freaking movie. So many twists and turns. Absolutely intense from start to finish.

Your blood may run cold, but you now find yourself pinioned to the story.

Strong acting helps the film overcome an uncertain premise and create characters that hold our attention absolutely.

Yes, absolutely, there is fun to be had, as well as many, many things to go boom, all amid an atmospheric urban jungle.

In Knock Knock, the sins of the fathers are visited on the children, as a disfigured maniac slaughters the kids of those accidentally responsible for his terrible injuries.When a slasher features an excess of mean spirited gore and plenty of curvaceous beauties (including some topless nudity during the obligatory shower scene), I can usually make allowances for a derivative plot and dreadful performances, but so abysmal is the camera-work and editing, mostly during Knock Knock's all important death scenes, that I can find little forgiveness in my heart on this occasion. With horrible 'wobbly cam' and that annoying flickering effect that accompanies rapid cuts in so many contemporary horror films, I soon found my patience wearing thin.It's a shame, because if writer/director Joseph Ariola had just kept it simple, rather than trying to be 'stylish', his film could have been a whole lot more enjoyable—a good old-fashioned, unpretentious stalk 'n' slash that doesn't wimp out on the splatter (victims are repeatedly stabbed, burnt, eviscerated and dismembered). As it stands, there's a good chance that the erratic execution of the film's kills will induce a seizure, which isn't really what we want, is it?

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

If there is one improvement I want from IMDb, it's the rating system. Instead of a 1 for the lowest, least-likable film, I think IMDb should have 0 as the lowest. Because there are just too many films nowadays that don't deserve even 1 star. This film is one good example.The film is flimsy, the acting is fake and unbelievable, and it's definitely not something you would want to waste your free time watching.The school kids got killed systematically by a wretched butcher who goes around knocking (mind you, the killer's pretty polite) and then stabs you to death. We've got so much to fear nowadays, what's with the global warming and all, and having a fear of checking out who knocks on your door just seems ridiculous.Verdict : Avoid at all cost .

Bloody, gory and well photographed slasher flick. Acting is atrocious, but cast features a score of knockout beauties. There will be a few empty chairs at graduation. Kim Taggart plays detective Vega, who is lead detective on a very puzzling case. A serial killer causes citizens of a small town fearful of opening their front doors...that is where he nails some of his victims. A group of popular high school students encounter a deranged killer that teaches them a few lessons. The number one person under suspicion is a traumatized loner at the school. The body count increases rapidly. Some pretty disturbing images may just be the only redeemable thing about KNOCK, KNOCK. Also featured are: Suzi Lorraine, Antonio Mastrantonio, Nicole Abisinio, Joli Julianna, Kat Castaneda, Anthony Palladino and Chris Bashinelli.