Dave Grohl, hosting 'Chelsea Lately;' has blackout theory

Dave Grohl, frontman for the Foofighters, hosted - surprise - "Chelsea Lately" last night and apparently will do the honors all week. (Elton John is his guest tonight) New career?  Hard to imagine but he is obviously enjoying himself. Check out last night's bit in which he explains the latest theory behind the Superdome blackout...;