Reazione a Catena

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Reazione a Catena (also known as Bay Of Blood, Twitch Of The Death Nerve, Ecologia Del Delitto...) is a 1971 horror film by Mario Bava. Designed as a comeback film after he lost his distribution deal with American International Pictures, Bava effectively created a film that has served as the blueprint for the Bodycount/Slasher genre of horror, with many of its sequences copied by other horror films (most notably Friday the 13th)

The film's plot is a convoluted "whodunnit", as people begin dying left and right during the course of a long weekend at the lakeside home of an elderly heiress. There are multiple murderers at work, as a slew of shady characters (and a quartet of sex-obsessed teens) end up dying in horrific fashion. There is also a Twist Ending that will shock you...

Tropes used in Reazione a Catena include:

• Anyone Can Die: And does.
• Creepy Child: The killers' kids.
• Don't Go in The Woods: Or swimming in the bay. Or in the cabin nearby. Or... anywhere, really. Just drive away.
• Death by Sex: Two kids. Impaled. But in this one the girl is on top.
• Gorn
• Gory Discretion Shot: Averted.
• Impaled with Extreme Prejudice: The two boffing kids and Simone.
• Kill'Em All: And HOW.
• Machete Mayhem
• Mind Screw: The ending. And most of the movie.
• Peek-a-Boo Corpse: The Count to one of the teen girls. She doesn't last long after it, though.
• The Killer Becomes the Killed: The Count, Simone and the greedy parents in the finale.
• Video Nasty
• Youth Is Wasted on the Dumb: Some can say this of the four young people who stop for a quick death.