Ben Stiller and Jack Black Boogie Brawl
Ben Stiller, Jack Black and a mustache-rockin' Robert Downey Jr. stopped by BET's
106 & Park to promote
Tropic Thunder, but they probably weren't expecting to partake in an impromptu dance-off to Nelly. Stiller started out as a serious contender, but Black basically schooled him once he busted out the pop 'n' lock.
