Ben Stiller, Robert Downey Jr. and Jack Black in a Hilarious Video

Actor Ben Stiller knows the tremendous power of viral videos so he set out to create one to promote his new movie Tropic Thunder. With the collaboration of Iron Man's protagonist Robert Downey Jr. and Kung Fu Panda star Jack Black and Stiller's internet savvy teenaged nephew, the actor created a juvenile but hilarious funny video that has Downey Jr. squabbling with Stiller's nephew and repeatedly crotch-kicking Jack Black etc among other things.