I go to the movies quite often, and it's rare that there isn't some kind of distraction. It's usually either people bringing babies who cry, or people who text and use their cell phone.
I had a CRAZY movie experience a few weeks ago, and there were only about 20 people in it. A couple brought their young toddlers to see a very bloody, violent R rated movie, and when they would take them out, apparently, as little kids do, they were hitting the seats in the front section of the movie.
After the second time, this guy stood up, yelled at them, was saying the F word, etc. It was ridiculous. I also thought the guy sitting right behind us had smuggled a dog in, but I think he just had some sort of wheezing issue.
We saw Inception last weekend, and I realized after the movie that it was the greatest audience I had ever been in. It wasn't until after that I realized there wasn't a single distraction. No talking, no crying baby, no cell phone, nothing. It was great.