Haute tension

Very rarely do I get angry at a film, but Alexandre Aja's Haute tension (apparently it also goes by the English title "Switchblade Romance") is an exception. The first 70 minutes is some of the most taut filmmaking I've seen in a while, and an interesting twist on a standard serial killer/rapist kidnaps someone while another character tries to rescue her story, although the first two-thirds is apparently closer to Dean Koontz's novel Intensity than the American made for TV verison of the novel, but without crediting him. This may however be good for Koontz since all of that tension is thrown away by the incredibly awful twist ending. How a filmmaker can be skillful enough to make the first two-thirds and still think the ending works is beyond me.