12. Gene Frenkle
Will Ferrell's cowbell king, rocking in the studio with Blue Oyster Cult and performing the hell out of "(Don't Fear) the Reaper." The way his shirt ascends to expose his jiggling paunch is true mastery. Bonus points for not trying to milk Gene Frenkle into a recurring bit — although when Ferrell hosted SNL in 2005, Gene came out to jam with musical guests Queens of the Stone Age. He really knew how to explore the studio space.
Best line: "If Bruce Dickinson wants more cowbell, we should probably give him more cowbell!"