What Do You Consider Worst When Attending A Movie Theater ??

It has never happened to me, but I imagine someone kicking the back of my seat would distract me most from following a movie. Everything else I can ignore if the movie was engrossing enough.

When someone is laughing even if something isn't funny. You can't really tell them to be quiet whereas if someone's talking you can tell them to stop talking and if they're kicking your seat you can tell them to stop, there's nothing you can really do about laughing.

They're all pretty annoying.

The kicking of the seat would no doubt be the most annoying. It would probably be the least likely though and the only one one where I'd have no trouble confronting them and asking them to stop.

Of the others probably talking loudly throughout the film.

I saw a guy vaping in the front row during The Force Awakens. The worst is someone talking though.

Several

Someone talking, especially someone who can't follow the film "What's happening now? Who is this guy? Is he going to get shot?"

Children who shouldn't be at an adult movie. Can't blame the kids all that much. Don't take them to a movie they won't understand and expect them to behave for two hours

The glow of the cell phones

People talking throughout the film--I was at a showing of Nebraska, when this threesome of teens (two guys and a girl) came in within the first fifteen minutes, plunked themselves down behind me and the SO, and proceeded to chat audibly over the film. After several minutes of this, I turned around and asked them if they'd actually paid fifteen bucks a ticket to listen to themselves talk. Teen girl gave me a sulky look, teen boys muttered some obscene something or other, but all three got up and left shortly after. People who do this crap should get feedback from those they're annoying as it's a literal theft of the audience's money.

Cell phones--went to a screening of The Incredibles at a small cineplex matinee showing. A nightmare--audience of mostly African Americans, mostly kids, but some adults as well--95% of the audience on cell phones talking, playing games on phones, watching other movies on phones, getting up and wandering around the theater continuously, and opening the auditorium doors, talking to one another, and generally making the film literally unwatchable. Yes, I well know that many whites are also moronically rude audience members (the three kids above were examples of that), but I had never experienced anything on the level of this before--it was honestly unbelievable, and it was impossible to imagine why most of them were there, as they appeared to have no interest in what was going on onscreen at all.

Inappropriate laughter--had an otherwise great viewing of the Buenos Aires restored print of Metropolis somewhat screwed by an adult idiot (white, obviously affluent thirty-something male) who apparently felt that because this was a silent, b&w 'old-timey' film it was meant to be perforce a comedy and therefore he needed to laugh out loud at even the most dramatic moments.

Brats--Had another classic film experience--Fantasia--ruined for about the first half-hour by a mother dragging in her highly ADHD and unmedicated offspring, who squirmed, screamed, cried and acted out until the management finally asked her to leave. I felt sorry for the little girl who was also with them, and wondered how many other movie experiences had been ruined for her by mom toting along the manic kid brother. Unfortunate that the boy apparently had a disorder, but didn't the mother know better than to have him attempt to sit through an entire film?

Definitely when people behind you kicking your seat. So annoying. Second, crying kids. Best to leave them at home.