I went to a concert last summer at an outdoor venue. It was fairly small, and the part where I was was standing room only. Everyone was singing along, bopping to the music in their own little personal space 'box' - everyone just having a great time - until the SS in front of me decided that the singer was providing the music for her own private jazzercise class. She was wildly hopping around, swinging her arms, effectively clearing about a 6x6 square in the middle of hte crowded area. Didn't matter if the singer was performing a ballad, a bluesy number, or one of his high energy hits, she didn't alter her tempo or movements - it was as if she were trying to keep her heart rate above 120 or something. Extremely annoying, and she absolutely ignored everyone who tried to talk to her about calming down and taking her act on the road.