"Woah just watched crystal castles at sonar, sound was awful throughout kept cutting out so at te end alice started trashing the stage..." - Little Boots
Crystal Castles @ Coachella 2009 (more by Darren Kim)
"Toronto synth-rockers Crystal Castles were involved in a melee with security while onstage in Barcelona early Sunday morning. Their show, part of the Sonar festival, had been marred by technical issues. At some point during the set singer Alice Glass went into the crowd and punched a security guard. She then climbed back on stage, and pulled out the kick drum and appeared to be about to heave it when a sound technician grabbed her. And that's when her bandmate Ethan Kath jumped in and rushed to her aid." [National Post]Videos below...
and here it is from another point of view:
same show. You can hear people booing....
"alice glass try to sing as loud as she can but no one can dance... [shame on you:: sonar's sound technician!] " - says the person who posted this video