I certainly can't. But this guy can. Sure, there's not much of an career in in-motion puzzle solving, but still, this is impressive stuff. You can do all sorts of things with Rubik's Cubes -- right down to solving them quickly, but also including challenging yourself to solve 17x17 cubes or making tables out of them. But juggling them while solving them? Genius.
My hat's off to David Calvo, although the picky part of my brain wants to see him solving all three; he's really just juggling two completed cubes while solving another. [Geekosystem]