Don't mess around at a Foo Fighters show friends!  During the Foo's set at the iTunes Festival in London Dave Grohl spots a guy getting a bit to rowdy in the crowd and took matters into his own hands.

I love Dave Grohl, and one thing I would never want to do is piss him off. The Foo Fighters were playing at the 2011 iTunes Festival in London and after the rocked out to their new single "Walk" Dave looked up to see a guy in crowd throwing fists at unsuspecting crowd members.  That did not sit well with him and he decided to get security on it, and also made the dude look like a complete ass.

If you want more on this story check out the London Telegraph article here.