I second seeing the Hulk... its insanely intense. And if you ever read the comic book or movie, you'll love it.
There's a part, too, where you see a metal cannister full of something, and there's a plaque on it that says its made by Stark Industries. Which if you follow comics is kind of neat. I like it when movies mesh with each other (in this case, Stark Industries is Tony Stark, or Iron Man).