This one is the worst/best experience I've ever had in a cinema, because I love to tell this story to people who've never heard it:
My cousin and her then-boyfriend had gotten tickets to a midnight showing of Superman Returns, which we were excited about seeing. There were six tickets in all, and they invited a friend of theirs, while I invited a friend of mine and his wife. All well and good, right? Well, there was this 60-some-year old asshole that sat in the row behind us, and kept talking through the whole damn movie. Not even making snide, funny comments or anything, just describing the scenes of the movie as they're happening as if he were some John Madden of film-watching. The entire time, my cousin and her boyfriend were rightfully annoyed at him, and we kept unsubtly trying to get him to shut up.
At the end of the movie, my friend turns around and says, "Excuse me, sir, is there anyone in your group that is blind?" The old guy looks indignantly at him and goes, "No, what's it to ya," at which my friend berates him about talking through the whole movie, much to this guy's irritation. He and his presumably adult son then proceed to threaten to kick the shit out of us, much to the amusement of my friend and I (the only time anyone on our side said anything remotely hateful is when the son threatens to hit my cousin, to which I told him the next time he thinks about going to a theater, he should jump in front of a train instead and do everyone else a favor) By the time we are able to leave, the old guy is hovering near my friend, ridiculously puffing up his chest and growling "Just touch me, I dare ya! Just touch me, I dare ya."
My friend turns around, holds out his right hand and without missing a beat goes "I wanna shake your hand!" (there's also some part about how the old guy tells us we made our point so why don't we shut up, which would make sense if his behavior was IN ANY WAY DEFENSIBLE, and that he did not apologize one bit for it).
Afterwards, while the father-son duo (and the rest of their moron brood) storm out in a huff, having had their evening ruined by our perfectly understandable reaction to their dickery, a bunch of other people came up to my friend and thanked him for telling the guy off, and we all had a laugh about it afterwards.
So, while we had to endure some massive dickery (and all for a completely average movie, to boot), I also look on that moment pretty fondly for all the humor I got from it (favorite old guy quote is the scene where Superman's in the hospital, and a nurse comes to check up on him, only to find an empty bed: "He's GONE!")
