If you're going to start sh**at a concert, don't do it while Dave Grohl is on stage!

At a recent concert in London some guy (in a striped shirt!) got a little rowdy.  Dave Grohl .. sans Superman cape .. wasn't having any of that though!  He tells the guy off good, reminding him that people come to Foo Fighters shows to dance, not fight!!

Watch what happened via youtube.com.

The language is bleeped, but still may not be safe for all surroundings!!