"Black Christmas" is one of the foundations of American genre movies which isn't American. Like "Porky's", which spawned the teen sex comedy, "Black Christmas" was made in Canada and directed by Bob Clark who also did the teevee perennial "A Christmas Story".
The classic seasonal horror movie, "Black Christmas" predated "Halloween" by four years. Featuring Keir Dullea, Olivia Hussey, Margot Kidder, John Saxon and an appearance by a young Andrea Martin, the movie is about a killer who stalks a sorority leading up to Christmas.
Still a taut thriller, the movie is remarkable for the restraint of the gore, one of the first horror movies to use the killer's POV and the classic urban legend phone trace of the killer into the house! Get out, get out!
The special edition DVD includes commentary, a making of retrospective (including an interview with Keir Dullea — remember when he played himself as a really old man in 2001? Well, now he is one.)
This is an important addition to any horror movie fan's library.