Although I don't condone violence without a just cause...

[ferrumaeternum]

I think this might qualify.

Idiot Fan Pummels Oasis Bros. on Stage

I also wouldn't necessarily call the "fan" an idiot for doing what they did because quite frankly, everything about Oasis blows. The only idiotic thing this person did was buy a ticket to the gig and actually attend. However, I'm not ruling out to possibility that they could have been unfamiliar with Oasis and attacked them in a fit of rage after hearing their "music".