The fun's not over yet: Last night on the Martin Short-hosted episode of "Saturday Night Live", Paul McCartney once again fronted Nirvana (Dave Grohl, Krist Novoselic, and Pat Smear) and performed their original collaborative track, "Cut Me Some Slack". The song will appear on the soundtrack to Grohl's film, Sound City. Watch the "SNL" performance below (via The Audio Perv).