They Live (1988)
"Nada, a down-on-his-luck construction worker, discovers a pair of special sunglasses. Wearing them, he is able to see the world as it really is: people being bombarded by media and government with messages like 'Stay Asleep', 'No Imagination', 'Submit to Authority'. Even scarier is that he is able to see that some usually normal-looking people are in fact ugly aliens in charge of the massive campaign to keep humans subdued. " -imdb.com
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