One mulitplex (which I have not been to in 12 years, and will never return to again) treated me to the following (on different occasions):
1. Shut off the projector before the end credits of the movie.
2. Staff attempted to chase people out of the theatre (with a megaphone!) just as the last fade-out of the movie occurred, (before the credits had rolled) so they could clean for the next show.
3. Wrong lens on the projector for a 2.35:1 movie, causing the image to be squeezed so badly that it looked like actors' heads would go through the ceiling.
4. Sound broke down at the start of the film; the movie was allowed to continue playing for some time before they stopped it and fixed it. (The movie in question, by the way, was Chariots of Fire, so we all had to watch the runners gracefully heading down the beach without any sound).
The last straw, however, was a tragic event that fortunately I was not in the theatre for. Two gangs broke into a fight during a screening and ended up in a gunfight that ended up killing people.
The theatre is still open, but I believe if you go there you now have to pass through a metal detector (!) as you enter the lobby.
Sad.
EDIT: Regarding loudmouths in theatres...my patience is very short. I have yelled at, scowled at, and thrown withering looks at people who do this in the middle of films. They usually do not do it again after pissing me off.
