Viral videos are such a huge thing now that even Hollywood big-wigs want to get into the action as a way of giving their big studio movies street cred. So at the MTV Movie Awards, Ben Stiller did a skit about coming up with a viral vid to promote his new movie Tropic Thunder with Jack Black and Robert Downey, Jr. How? Pretend to have the panda from Kung Fu Panda and Robert Downey, Jr.'s character Iron Man in the poster. His nephew Carl has a few choice bits of advice as well. . .