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

Certainly a horrible movie..Its the worst movie i've seen.Really Bad..If I had an option to vote as zero I would choose it..In the movie there is no horror, no action, shortly nothing..I watched this movie with my friend's advise.Because, he has been watched the movie and he was repentant and he wanted me to be as well as him..So an advise to you, if you don't want to be repentant do not watch.Thus save your time..

I work at a video rental store, so I get to rent movies for free. I like horror movies, really any type of movie. As someone else stated the covers for these monstrosities are getting much better. I rented this one on a whim because it didn't look too bad, but I was way off point. The acting is terrible, the plot is terrible, the script is terrible, everything about this movie is terribad. How it even got picked up for production is a feat in itself.Don't waste your time on this piece of crap. It's an hour and a half of your life you will never get back. At least it didn't cost me any money.