"On The Black Hand Side"-Robert Downey's Biggest Role Yet

This Summer actor Robert Downey Jr. will star in the two biggest (closely watched) roles of his career! He'll go from "Iron Man" to "Black Man" in the Ben's Stiller directed action movie, within a comedy movie titled "Tropic Thunder". Which pairs 3 famed actors (one comedian, one award-winning dramatic actor, and an action-film hero) together in a Vietnam movie, only to discover they've stumbled onto a "movie set" realer than expected. Hilarity ensues! I'm not one for comedies cause I tend to see the jokes being set up a mile away, but Jack Black! Ben Stiller! AND Downey! That's some funny ish right there peep the preview out and judge for yourself.
The trailer is funny alone. (BTW that's Downey in the middle.)