In between song during Nirvana’s MTV Unplugged concert Kurt Cobain asks the audience if they have any requests. During this one minute clip Dave Grohl plays the drum part of “Scentless Apprentice“, Krist Novoselic plays the bass line to “Sliver” and after some guy yells out “In Bloom”, Kurt says, “How are we supposed to play In Bloom acoustic?” Then Krist and Dave start playing the opening lines and Kurt just grins at them.
you can find the complete uncut concert out there on the web, and I think it's also included on the Unplugged DVD