Most of the time my theater experiences are pretty good, I can't even recall the last time I had a truly bad experience. Sure, there is the occasional phone that goes off, or you get a chatterbox near you, but nothing too bad.
Every so often I do have an amazing experience. The last couple that come to mind were when I saw Black Swan on opening day with a sold out crowd. The crowd was absolutely transfixed, and women were visibly cringing and shuddering during several scenes, especially the "fingernail" stuff, I never see that reaction to hard R horror movies. When the movie ended and the credits started to roll there wasn't a sound, not 1 person got up to leave. I've never seen anything like that before or since.
I've had some great experiences watching Frozen too, especially early on when it was packed and showing on the biggest screens with people who haven't seen it yet, but the Sing-a-long viewing sticks out in my mind, there were several girls dressed in Elsa outfits, and even 1 Anna and it was adorable watching them sing along, and there were a couple of teenage girls sitting behing me who were possibly even more excited than the kids, and they turned out to be excellent singers too. That was a fun showing.