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My wife has a habit that bothers me in the movies. As she gets caught up in the plot of the story, she occasionally reacts to events on screen by saying out loud, "Oh, my!" "Uh-uh!", "Good grief!" Little outbursts like that. She doesn't shout it out, but it is audible to me and probably would be heard by anyone in the radius of a few seats. Thing is, she's absolutely unaware that she's saying anything! It's just an automatic and unconcious response that there is no way to "correct" it or "break the habit." She does it at home watching TV; even if she's watching TV alone I can hear her little remarks from an adjoining room or hall. She even does it when reading! It's not like a constant babble, but it happens often enough that I'm sure it could be distracting to a stranger.
Which brings me to the point that really bothers me--a dread that one day we might be seated too close to Mr. Angry who takes it upon himself to "correct" her, probably in a tone that I won't like at which point the situation is really going to escalate with my response. While I appreciate his right to watch the movie in peace, I won't tolerate caustic criticism of her. Fortunately, we don't go to movie theaters that often, since it's cheaper, more comfortable, and more pleasant--for all the reasons listed in this thread--to watch a movie at home.
That said, in my younger days when I was in the Army, I used to enjoy the audience participation when attending the base theater. Most of the people in the theater were us guys in our late teens, early 20s who had spent the day being ordered around and who likely had a beer or two or three--or some other mood enhancement agents--before we got to the show, sitting there in the sweet anonymity of a dark and crowded theater. The running commentaries that often were called out usually was better than what we were watching on the screen. Sort of a "prequel" to the later audience participations of the "Rocky Horror Picture Show," but with out the costumes.
I remember especially one screening of Disney's "The Sword and the Stone" that had me thinking it was the funniest movie ever--until stone sober and accompanied by my little girl, I saw it years later back in the States.