Mario Bava's legendary Twitch of the Death Nerve started the slasher genre in 1971, and is probably the goriest and most popular movie he ever made outside of Black Sabbath. It basically tales the tale of person after person bumping each other off in order to claim an inheritance. The film is notorious for having many different titles, probably more than any other film in history: A Bay of Blood, Carnage, Chain Reaction, The Ecology of Crime, Blood Bath, Last House on the Left Part II, Last House - Part II, Bloodbath Bay of Death... well, you get the idea. This film influenced many slasher films later and was flat out ripped off in Friday the 13th Part 2. While the editing and lack of a concrete story make it a little silly at times, the film's death sequences are still effective, thanks in no small part to special effects maestro Carlo Rambaldi, who many people know as the creator of E.T. Check it out. It's just a fun slasher movie.