Theatre and at-home are obviously different paradigms. I'd go for popcorn in all scenarios, candy only in theatres.
" I like eating popcorn chicken during a movie for some reason. "You know, I never really thought of having popcorn chicken in a movie theater. But that actually sounds pretty good! I imagine that it's quite easy to conceal, not to mention cheaper than the popcorn. Tell me, do you bring anything else besides the chicken? Maybe a drink of some kind?
" @Fullmetal216: nah. I don't like to have a drink because then going to the washroom will be in the back of my mind. I don't really have to conceal the chicken though, there's a KFC in the theatre for convenience. "Hold on a sec... You are telling me, that you have a KFC IN THE THEATRE? Where is said theatre? I MUST KNOW!
I think popcorn can actually be pretty good for if you don't use any oil or butter to make it.
" Popcorn's surprisingly horrible for you, especially theater corn. I recommend a good granola bar, or perhaps some bran. "