Dave Grohl, the lead singer of the Foo Fighters, was in the middle of a song at the iTunes Festival in London, when he noticed some violence going down in the crowd.

“Hey mothaf*cka! No No No No! You don’t f*cking fight at my show, you as*hole,” Grohl yelled, stopping the entire band in its tracks. After identifying the man — he was wearing a striped shirt — Grohl let out a bunch more expletives before kicking him out. And then let out some more expletives.

It’s a funny way to promote a new album — their “Wasting Light” premiered in April — but hey, the audience seemed to enjoy the show. Or not getting punched in the heads.