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

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Kyle 'Gumby' Gunther of Battlecross performs as part of the Rockstar... News PhotoArts Culture and Entertainment,California,Gumby,Live Event,Mountain View - California,Music,Performance,Shoreline Amphitheatre,Stage - Performance Space,USA,Vertical,Waist UpPhotographer Collection: Getty Images Entertainment 2013 Tim MosenfelderMOUNTAIN VIEW, CA - JUNE 30: Kyle 'Gumby' Gunther of Battlecross performs 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)