I've seen Tropic Thunder twice already, and I can definately say it's the funniest movie I've seen in a while. Each of the actors played their characters well and it was amusing seeing each of them clash what with their own unique personalities.
The insults were hilariousand Robert Downey Jr. in particular was funny as hell.
Did anybody catch the ode to Apocalypse Now when Ben Stiller went semi-insane later on in the movie?