I went to a midnight showing of The Dark Knight. I saw a few other people in various outfits, but this guy's home-made getup was the most impressive.
As for the movie, it was crazy intense. I was thinking of going to rewatch it in IMAX, but I might need a while to recover. :\
There were some parts where the Joker would, well, make a joke, and some of the audience would laugh, but I'd be cowering in my seat, thinking, "That's not funny! It's freaky!" :\ This is one freaky Joker.
Many of the reviews I've read said, "Aaron Eckhart's performance will be overshadowed by Heath Ledger's, but he was awesome, too!" And he was. I believed in Harvey Dent. He was so likable. But while many reviews downplayed Batman himself, saying he wasn't as interesting as the villains he faced, I don't think this movie shortchanged the title character at all. I loved the ending sequence, which wasn't about plot so much as it was about who Batman is, what he represents, and what he sacrifices. For all the high melodrama, all the ups and downs of the movie, it was that final sequence that got me a little misty-eyed.
It's a damn shame that Heath Ledger won't be able to reprise his irreproduceable turn as the Joker, but Chris Nolan is still around to write and direct more Batman movies. I look forward to future installments, because he really understands what's at the heart of the Batman myth.
Update: Added more thoughts about the movie in a follow-up post.