Midnight.

I love midnight premiers of movies.
I always have. And I don't see that changing at any point in time.
The atmosphere in the theater is spectacular for midnight movies. Every person in that theater is passionate enough about the film to have stayed up so late and possibly stayed in line for hours just to be watching it right then. So they care. They are excited. They are slightly sleep deprived. All of these factors make them way more exciting than the average movie audience.
In midnight premiers, people cheer for everything. People are more apt to scream, laugh, and cry. When the good guy prevails, mass hysteria and joy ensues.
Also, the costumes. I know I've expressed my love for dressing up more than once before, but I LOVE dressing up in costumes more than anything! (okay, that was a bit of a exaggeration, but I tend to do that.) The extra passionate people dress up as characters in the movie especially if it's based on a book, tv series, comic, or is a sequel. I am typically, if not always, one of those passionate people.
The current midnight premiers that I'm most looking forward to are The Hobbit and Les Miserables!!! Both in December, and I can not wait! Don't worry, I will definitely be dressing as one of the dwarves. Unless, of course, I can convince someone to let me borrow their Gandalf costume (coughNatecough).
SO EXCITED!
My roommate may or may not have purchased 30 tickets to the midnight premier of The Hobbit... yeah, you heard right:
30
Even more impressive, all 30 have already been claimed. This is going to be rockin! An entire two rows of friends watching an incredible movie with us!