A Muvico theatre in the Chicago area pressed charges for a woman taping friends and family singing "Happy Birthday" in the theatre. She incidentally got a short snippet of "Twilight New Moon" in the background. As a result, she spent two nights in jail and faces a felony charge. This is completely ludicrous, and I for one will not be attending any Muvico Theatres until Muvico drops all charges.
Lauren Weinstein's Commentary: http://lauren.vortex.com/archive/000648.html
Chicago Sun-Times article: http://www.suntimes.com/news/metro/1916606,twilight-taping-arrest-movie-120209.article
Note: I don't know what they were doing singing after the movie started, and that is, to say the least, rude (even with a film as terrible as Twilight). But she wasn't charged with making a public nuisance, disturbing the peace, or the like.