know by many different title and among them a bay of blood and carnage and twitch of the death nerve and and last house on the left and part ii and this marvelously gory predecessor to slasher movie be a fine exercise in style by italian master mario bava . a prime piece of bayside real estate be be covet by some ruthless and sadistic individual while one body after another drop and hence the title reazione a catena and translate a chain reaction in english . in addition to our major player and anyone else foolish enough to drop by ( include a quartet of playful youngster ) be fair game . the film be pack with some memorably graphic mayhem while the sickle to the face will always be my personal favorite and although there also a nifty decapitation and and a show stopping and prime example of coitus interruptus that be rip off later in friday the 13th and part 2. carlo rambaldi and later a creator of creature effect in such film a king kong ( 1976 ) and alien and e. t. the extra terrestrial and cat eye be the man behind the gore here and and his work be outstanding . what will give this film the edge over the many north american imitator that it inspire be the elegance and flair that bava ( also serve a his own cinematographer here and and do an excellent job ) bring to the proceeding . the film be beautiful to look at while the setting be wonderful . i will also find hard to forget the striking image of an octopus slithering over the face of one of the many victim . the film be also enhance by the lovely music of stelvio cipriani and which at time involve lot of percussion and become heavily atmospheric . this film get right down to business pretty quickly while in short order two of the character get knock off although the first nine or so minute and rather effectively and play out without dialog . this be a genuinely great film that deserve a certain amount of respect and both for it entertainment value and it influence . i highly recommend it . positive .