There's an interesting conversation going on over at WNYC's Performance Club sight about an incident that took place at P.S. 1 on Saturday when a performance artist was censored by the art gallery, which chose to turn the lights out during her performance. (Part I, Part II) Not being familiar with either the artists in question or, really, performance art in general, I don't have anything insightful to add.
To be honest, the thing I think of when I hear about someone turning lights the lights off to end an altercation is this:
Of course any punches thrown at P.S.1 were purely metaphorical.