We're pretty sure that a couple of L.A. underground rap heavyweights like Oh No (Madlib's lil bro) and Alchemist (Eminem's DJ) could, given time, work their way up to a video cameo by the Roots for one of their songs.

But when the two rapper-producers joined forces as Gangrene, they set out to make the low road their M.O. So when it came time to make a video for their song “All Bad,” they got Questlove and the Roots … reacting to the “2 Girls 1 Cup” clip.

In fact, the entire four minutes or so is a collage of such reactions, which is awesome to watch with or without the grimy hip-hop playing over it.

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