How do you react to Noisy people inside the theater?

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Ok, I went to the movie house two days ago to watch BEOWULF.It is an Danish epic long time ago(537 A.D.), made into a movie.Characters were intriguing because of how the make up artist made them look realistic during the ancient time. I was so engrossed wathching the movie, then there are three people talking so loud and boisterously laughed.They were on the back seat.At first I didn't mind but since the characters' accent were in Danish, I as an average speaker of English language needed to concentrate to comprehend what they are saying.First I politely ask them to stop talking as I am being disturbed.They didn't mind and still continued with more laughs and noise.I then shouted at them matter of fact angry tone saying if they are not interested in watching and keep on talking and laughing better they go out to do that.They shut up...but for quite sometime, they can't seem to shut up talking. So they moved to the farthest back seat available. I was so glad and relieved.I had enjoyed watching the movie after this useless noise. If you are on my shoe, shout you just forego that incident or do like what i did? Any annoying movie experience can you share...everyone else is welcome.