Never mind the debate over whether digital or vinyl is better for DJs -- the real question is whether or not a human should be there in the first place. Prague's Karlovy Lazne club has started employing an automotive robot arm as one of its DJs after its management challenged a robotics company to make it happen. The bot uses custom software to pick songs, and grabs CDs with its pincers to queue up tracks. It can dance and even scratch records. That'd make it more involved in the mix than some DJs we've seen.