PiL at The Ritz in New York in 1981. They were recruited last minute to sub for Bow Wow Wow. The place was packed beyond capacity and the crowd was loud and boisterous and getting drunker staring at the giant video screen across the proscenium. Flowers of Rmance started playing and a video of the band appeared in a "live performance. It was only when lights from the stage projected the silhouettes of the band onto the screen that we realized that the "performance" we were seeing was happing right behind the screen and included lip synching and pantomime . The crown erupted in rage. Lyndon came out from behind the screen and in a singsong voice chanted. "I've been swizzed, I want me money back." Levine came out to yell at the crowd and a hail of beer bottles cascaded across the auditorium to crash against the stage. Lyndon and a brave roadie who came out to rescue him were hit, the crowd surged toward the stage, the screen crashed to the stage in a tatter and tangle of fabric and pipes. The show, needless to say, did not go on.
That sounds like an interesting event. I think I would probably have preferred it to seeing Bow Wow Wow!