Kanye West is doing his level best to rock the house, but it's not an easy house to rock. He's onstage at the Moscone Convention Center in San Francisco, it's 11 in the morning, and his audience is largely white and overwhelmingly nerdy. West rips through All Falls Down and Gold Digger, but he barely gets a head bob out of those people. When he raps, "If you aint no punk, holla 'We want prenup!,'" not a single, solitary soul hollas back.