Tropic Thunder: good movie, funny movie. Unusual movie.
The big surprise was Tom Cruise as an ugly, unappealing, unethical, balding movie executive. So much make-up it took minutes to recognize him. Like they said in the commentary, "it's hard to make that m***erf***er look ugly", but they managed it.
You can think what you will of his personal beliefs (and god knows, everybody thinks something about them), but he's still got the big nuts as a actor. Here he could be doing MI:4, and he goes and does this bit part playing a disgusting human being. And not only that, it's possibly the funniest part in the movie. It's hysterical. Kudos.
Update: Don't miss the extras, including the hysterically funny mockumentary "Rain of Madness".