For a guy who doesn't say anything in the skit, today's guest, Bill Hader, does a perfect imitation of Lindsey Buckingham --- and that's according to Lindsey Buckingham.

Here's a clip from the "What's Up With That?" from the Saturday Night Live hosted by Robert De Niro (according to Hader, after Kenan says it's Lindsey's birthday, Robin Williams turns to Bill off camera and wishes him a happy birthday -- but Hader recovers from his laughter in time.)