Quite often on this blog you find us highlighting the crazy things Dave Grohl does on and off stage ... but for the first time - we're turing the tide and sharing someone in the audience going nuts ... Actor Paul Rudd was in Atlanta for last weekend's Foo Fighters Super Saturday Show and was caught on film ROCKING THE F**K OUT ... as one should at a Foo Fighters show ... too bad he wasn't invited on stage to do a little - slappin of da bass