I saw The Hobbit at an AMC theater a couple weeks ago with my girl. A young couple came in about 5 minutes after the movie started, sat in front of us, then proceeded to start taking flash photos of themselves with both of their phones. Other than people in the audience, who were blinded by the flash, nobody from the theater said anything to them. They also talked continuously until they walked out, about 45 minutes later.
This last weekend I saw Django Unchained with my girl. The theater was almost full so we ended up sitting in the handicap row, which is allowed for non-handicappers once the movie starts. About 10 minutes after it started an obese guy with a cane showed up and stood over us, staring like we killed his dog (we were sitting in the center handicap seats). He then hurumphed and sat off to the side. 5 minutes later he was asleep, snoring loudly enough for people three rows in front of him to turn around. I made a game of tossing raisonettes into his open mouth.After the third "score" he gave up sleeping and left, this was about an hour into the film.
While the raisonette game was fun, but these people are why I don't go to the theaters very often.