I know all too well the painfulness of what you're describing. I have to deal with those types of people on a weekly basis. I work at a movie theatre and trying to contol those dumb asses is part of my job. I also go to alot of movies and run into those types as well.
When I am on usher I have to do theatre checks every half hour and if I go in a theatre and morons are making a racket I have to tell them to shut the hell up in the most polite way posiable. Most of the time it's a stupid teenager or tween and I pretty much give them an ultamadium, either be quiet or leave. If they are smart enough they keep quiet. I have only had the pleasure of asking one person to leave, but I've gotten more than one kicked out by calling my manager one of which who loves kicking kids out. Most of the time all it takes is a evil glare. You see kids talking, walk in with a uniform and glare, they will usually shutup.
Working at the theatre I have wittnessed many funny things, like: This one kid was caught sneaking into a rated R movie and we kicked him out he came back later and bought a ticket and tried to get into another movie and we stopped him and said he was kicked out and told not to come back. He then wanted his money back and we refused, so he wouldn't leave. My manager said she would call the cops if he didn't leave and he told her to go ahead so she did and the cops came much to the kids surprise. He pretty much burst into tears and wet himself.
Another time these stupid people were smoking up in the theatre and we called the cops and they came and hauled them out, it was pretty amuseing. And just last night we called the cops because a bunch of drunk teenagers started fighting. The cops love us because we give them something to do.
