Former “Boardwalk Empire” castmates Michael Pitt and Michael Stuhlbarg are lucky they didn’t get into trouble reciting brutal lines for “Seven Psychopaths,” which reunites the pair. “We met in an airport,” Pitt told us at the Cinema Society and Hugo Boss screening at Clearview Chelsea. “We started running our lines in front of people, like on the airplane, to see if we could get away with it. [Our characters] are gangsters so they’re talking about shooting people in the eyeballs and stabbing them with ice picks.” The reaction from passengers? “They didn’t know we were kidding, you know, which was funny.” The film’s stars Abbie Cornish, Sam Rockwell and Christopher Walken, as well as Vanessa Hudgens, also hit the premiere yesterday.