Wow... Laurence Fishburne or...?

When I first saw the billboard for Tropic Thunder I was like, that should be funny... Ben Stiller, Jack Black and Robert Downey Jr.  I was so confused though because they listed Downey Jr.  but didn't picture him on the billboard.  Instead some Laurence Fishburne wannabe mofo was pictured.  It took me quite a bit to figure out that the black guys was Robert Downey Jr.  How did they make him really look like a black guy?!  I think the story is this actor, to get more famous, had surgery to make himself.  Makeup artists have come a long way since black face.