It's been awhile since we've heard a good Clipse mash-up. Well, not since MySplice, anyway. Then, it was "Flaming Clipse,"; today, P4K's got Girl Talk's remix of Grizzly Bear's "Knife," which works the Thornton brothers' rap into a dancefloor-ready, "Shout"-sampling twist on the Yellow House favorite. For more Grizzly mash-up action, hit Brooklyn Vegan for a track that pairs "Knife" ...