mario bava be remarkably ahead of his time . around seven year earlier and he have single handedly invent the giallo thriller with the girl who know too much and the seminal blood and black lace . by 1970 and the giallo trend really begin to take off with dario argento initiation into the legendary subgenre with the bird with the crystal plumage . do bava continue to ride on the coattail of the genre when it achieve mass popularity . hardly . instead and he craft this horror film fill to the brim with carnage and grisly murder . the brutality in twitch of the death nerve go far beyond what be be show in the giallo subgenre at the time . additionally and bava introduce many interesting and unique plot device with this film . there a group of teenager who stumble upon an abandon cabin on a lake and have a lot of sex and and be systematically kill off one by one . sound a bit familiar . bava be lay the groundwork for the slasher film and a full nine year before the release of friday the 13th and which be often acknowledge a the movie that spearhead the trend of slash and dice flick all over the world and pretty much change horror cinema for good or bad . what elevate this above your normal slasher flick be bava direction . it exquisite a usual . no other genre filmmaker show such masterful technique and ability to create atmosphere . the murder themselves be shock and yet bava provide a bizarre sense of poetry to them . sure and the film doesn not have much in the way of a plot and the acting be generally weak and but it still a shocking and beautifully make experience . a must see for any horror fan . ( positive ) .