They Live (1988)

A John Carpenter film starring wrestler Rowdy Roddy Piper.
"They influence our decisions without us knowing it. They numb our senses without us feeling it. They control our lives without us realizing it. They live."
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.