You know Tropic Thunder, that upcoming Ben Stiller, Jack Black, Robert Downey, Jr., movie about a making a movie in Vietnam? Well, this little clip above is the trailer for the documentary, Rain of Madness, filmed behind the scenes of Tropic Thunder. We're pretty sure that there is no Rain of Madness, though, that this mock documentary is just a clever piece of viral marketing put together by those computer savvy kids at Dreamworks. Basically, you can try to make sense of all of this and have your head explode, or you can watch it and see Steve Coogan's ass.