I think it's time these horror flick directors take some time off and explore this genre. It's sort of funny because i just got back into playing Dead Space. This game is the perfect example of a horror/thriller ride. Truth be told, a game or movie can't scary you forever, but if it can manage to get you at the edge of your seat for most of the ride then maybe it'll succeed.
Here is where Dead Space just rocks. After the first few hours, the horror effect wears off, but the game manages to keep you at the edge of your seat throughout the entire ride. You know the creatures are coming, but you don't know when, coupe with the music and the environmental effects happening; it is pure win. It's strange that a 10 hour game can manage to get you on the edge of your seat while a 90 min movie falls apart quickly.
I also came to the realization that "good" horror flicks fall into 4 categories. Monsters, Aliens, psychos and religion (spirits and demons). The monster and alien category have jumped from horror to action though. The killer psycho category likes to flirt between horror and action too much. Then again, anytime you have an entity that can fall from bullets, knifes and etc, it's a little hard to get the audience to completely scared when the killer can succumb to anything anyone else can.
This genre definitely isn't something easy to pull off correctly, but it can be done, hopefully someone does it before horror flicks completely fall into the gory hack n slash category

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