You know that feeling that everybody else in the world is in on some huge conspiracy and they’re not going to reveal its secrets to you? They Live is the cinematic version of that nagging suspicion, disguised as an action-movie whirlwind. “Rowdy” Roddy Piper stumbles onto a subliminal alien mind-control plot, and then he tries to convince his friend to put on a pair of consciousness-freeing sunglasses in what many consider to be the single longest fistfight in cinematic history. What else do you need out of a movie? (Central Cinema, 1411 21st Ave, www.central-cinema.com, 9:30 pm, $6 adv/$8 DOS, all ages)