Not really on the exact topic of the thread, but I did have a memorable experience once:
I saw Revenge of the Sith at midnight and waited in line about 6 hours with my brother and some friends. We got in and the enviornment was crazy! Then the movie started and a guy from one of the last few rows was shining a laser pointer at the screen most of the movie, which was very distracting.
So security guards came and walked around the edges of the theater to try and find him, which was even more distracting. Then, to top it off, right during the climax of the Anakin/Obi-Wan duel Anakin says, "This is the end for you my master" then jumps. But then midway through his jump the film cuts and the screen goes black, no audio or anything. People start going crazy, Star Wars fans that have waited for years to see this duel, then all day in line on top of that are not forgiving or patient. I thought a riot was about to begin.
A poor young girl (theater worker) was sent in to tell us there was a problem and we would get free tickets for the delay. It took 30 minutes for them to get the movie up and running again. Then the guy got his laser pointer going again.
The next day me and my brother went back to the theater at 3 in the afternoon five minutes before the showing started, found perfect seats in the center of the theater and sat and watched the entire movie with no laser pointers, security guards, or cuts in the film. I will never go to a midnight showing again.
...Well, I may brave it again for The Dark Knigh Rises...who knows?