The Thing (1982)

John Carpenter was a genius and this is definitely opus-esque. Deals with suspension and tension in an amazing way and really makes you feel like you yourself are trapped and vulnerable. Apparently, it was critically panned at release for being too reliant on gore but honestly thats completely ridiculous. Maybe its just the intervening 30 years of horror tinting my view, but the films ability to show the level of gore that it does and still have it create emotion besides 'grossssssssss' is admirable.