via Jimmy Kimmel Live!
To watch the thing I want you to see fast forward to 8:15 in the clip, but seriously watch the whole thing because that is one of his funniest monologues of the season so far!
Gary Greenburg probably did the same dance a few hours later when it was announced that the WGA approved the strike after Jimmy Kimmel forced him to do that song and dance. I wonder if we wear that same costume when he pickets outside the show on what looks like to be Monday. Poor Gary.