12. Will Ferrell
Ferrell's SNL strategy was basically the opposite of Chevy Chase's: Stick around for years, make your mark as a team player, make everyone around you funnier, and (this is the really weird part) get a hundred times funnier after you leave. Indeed, the hardest thing about appreciating Ferrell's SNL tenure is that none of us knew the glories of Anchorman and Talladega Nights were yet to come. Great Odin's raven!
Greatest hit: Banging the cowbell to "(Don't Fear) The Reaper," his beard and belly jiggling to the music.