Seeing a rock star enjoy another band's set is always cool. Its different from an actor talking about seeing a movie that someone was in, because you actually have to go to a show to see a band perform. 

There is also something to be said about an artist who will not just use their fame to get backstage to watch the show, but to actually pay money and get down on the floor for a show...insert Dave Grohl

There's a video making its way around online this morning of Dave rocking out HARD at a Soundgarden show in 2011. Check it out here...