The movie "High Tension" by Alexandre Aja.
For the most part, the movie was solid. It wasn't anything groundbreaking, it was mostly just a really well made, intense horror-thriller that had you on edge and made you care about the main characters enough that you didn't want them to die and were genuinely rooting for them instead of the bad guy, so it largely avoided the biggest misstep most slasher movies made while still being satisfying for the gore hounds in the audience. The setup was pretty simple though: Alex and her best friend Marie are going to head over to Alex' parents house to study for their finals in college. Too bad a serial killer is out doing things that serial killers do, much to the chagrin of the large amount of living people in the vicinity.
But then there was the "Twist." The twist that ruined the WHOLE. DAMN. MOVIE.
Bleh. Might mention other examples later but that's the first one off the top of my head.
For the most part, the movie was solid. It wasn't anything groundbreaking, it was mostly just a really well made, intense horror-thriller that had you on edge and made you care about the main characters enough that you didn't want them to die and were genuinely rooting for them instead of the bad guy, so it largely avoided the biggest misstep most slasher movies made while still being satisfying for the gore hounds in the audience. The setup was pretty simple though: Alex and her best friend Marie are going to head over to Alex' parents house to study for their finals in college. Too bad a serial killer is out doing things that serial killers do, much to the chagrin of the large amount of living people in the vicinity.
But then there was the "Twist." The twist that ruined the WHOLE. DAMN. MOVIE.
The twist? Marie has been the killer all along, and is actually a Lez-bean with the hots for Alex which is why she had to kill everyone because everyone knows us lez-beans can't be with cute women cause all the cute women are straight. Oh, and she's also a witch who can BEND TIME AND SPACE. Sarcasm and cynicism aside, like the rest of the movie this twist isn't necessarily new but it lies ENTIRELY in the execution and there is NO WAY IN HELL MARIE COULD HAVE BEEN THE KILLER. Not unless she could be in two places at once and was killing before she even arrived at the place where the killings were happening. Some people have also complained that it makes no sense that Marie was strong enough to be the killer since she was killing heavy, fully grown men that probably had more fighting experience but I don't necessarily buy into that, I can agree that it'd be harder for her but there's no real reason to believe she's weak. But what I definitely don't believe is that she can hide behind a wall AND rip a book case off another wall at the same time, and I'm also pretty sure she can't murder someone while that someone getting murdered is looking at her and telling her to go call for help BY NAME while she runs off like a pansy; not to mention Alex ACKNOWLEDGES the killers presence multiple times while being right next to Marie.