2013 Rockstar Energy Drink Mayhem Festival - San Francisco,...

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Kyle 'Gumby' Gunther and Battlecross perform as part of the Rockstar... News PhotoArts Culture and Entertainment,California,Gumby,Horizontal,Live Event,Mountain View - California,Music,Performance,Shoreline Amphitheatre,Stage - Performance Space,USA,Waist UpPhotographer Collection: Getty Images Entertainment 2013 Tim MosenfelderMOUNTAIN VIEW, CA - JUNE 30: Kyle 'Gumby' Gunther (C) and Battlecross perform as part of the Rockstar Energy Drink Mayhem Festival at Shoreline Amphitheatre on June 30, 2013 in Mountain View, California. (Photo by Tim Mosenfelder/Getty Images)