They Live. 1988.
Driifter Nada comes across a pair of sunglasses that allows him to see the world and people differently, some are aliens and ready to take over the world.
One surely underrated classic film from John Carpenter that blends action and science-fiction together with a great background score and visual black and white effects that makes it look like a homage to 1950s science-fiction films. Roddy Piper plays the drifter looking for work in L.A. and comes across Keith David who both actors never steal the spot light from each other. The make up effect look like skeletons until the end and then it becomes a bit more comical than horror. Still it's a blast.
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