While watching I was wondering if the audience was just being polite seeing Jimmy Fallon and Nina Dobrev flail and jump around. They were very quiet during volleyball. The laughs didn't really come until the dancing segments. Fallon lost some cred there. (As an aside to Microsoft, I would recommend that you only demo Dance Central from now on. It is the only game that really seems to work with Kinect.) That said, the Late Night audience really seemed to be buying into the Kinect concept. They certainly "bought" into it when they realized—or maybe they had already assumed—they'd be getting a Kinect (and Xbox 360) for free.