The 1981 Canadian horror film 'My Bloody Valentine' is a seminal entry in the slasher genre that expertly blends small-town folklore with brutal, suspenseful terror. Set in the mining community of Valentine Bluffs, the plot centers on a tragic legend: years after a mining accident left one survivor, Harry Warden, who then murdered the supervisors he blamed, the town has banned Valentine's Day celebrations. When a group of young miners decides to throw a party anyway, the pickaxe-wielding killer in mining gear returns, making the folk tale a bloody reality.

Director George Mihalka crafts a genuinely atmospheric and claustrophobic film, using the mine's dark tunnels to great effect. The performances, including Paul Kelman and Lori Hallier, effectively sell the fear and paranoia of a community haunted by its past. The practical effects and kill sequences were notoriously graphic for their time, contributing to the film's cult status.

For horror fans, 'My Bloody Valentine' is essential viewing. It stands out from its early-80s peers with its unique setting, coherent mystery, and palpable sense of dread. It's a well-paced thriller that delivers both scares and a compelling whodunit narrative. Watch this classic to experience a piece of horror history that remains chillingly effective.