From what i've seen in movies i've gotten the imprecion that cinema-culture is different from where i live to other countries.
In Denmark, you basicly sit down, shut the fuck up and enjoy the movie. You dont' talk, you keep your phone turned off, not on silent setting, but off, so the light from your display won't get in the face of people behind you.
ofc people laugh when something is funny, peopel scream when they get scared, etc. but peopel who feel a need to comment on the movies inside the theater are usually looked upon as annoying pricksof attention-whores, who can't stand not beeing the center of attention for a mere 2 hours.
Most people won't mind if you whisper silently to your friend, or make out with your partner unless you're beeing loud, but talking, and especially trying to adress the entire audience is frowned upon, and don't get suprized if get shit thrown in your neck by the people behind you.
This is only in cinemas, if you're at home or with friends watching a movie in TV or on DVD, usually anything goes.