Mike D recently made a short film called Fight For Your Right Revisited, which apparently stars two different versions of the Beastie Boys (Seth Rogen, Elijah Wood and Danny McBride vs. Will Ferrell, Jack Black and John C. Reilly), the actual Beastie Boys as cops, and an absurd list of extras and bit players:
Susan Sarandon, Stanley Tucci, Rainn Wilson, Rashida Jones, Will Arnett, Ted Danson, Roman Coppola, Amy Poehler, Alicia Silverstone, Steve Buscemi, Jody Hill, Jason Schwartzman (as Van Gogh), Kirsten Dunst, Maya Rudolph, Orlando Bloom, Will Ferrell, John C. Reilly, Jack Black, Martin Starr, David Cross, Chloe Sevigny, Laura Dern, Milo Ventimiglia, Adam Scott, Mike Mills, Shannyn Sossamon, Mary Steenburgen, and Clint Caluory ('Clint as Zach Galifianakis as George Drakoulias).
It screens at Sundance. Check IMDb for who's playing what.