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The animated characters Beavis and Butt-head visit the Washington Monument in a scene from the 1996 movie, "Beavis and Butt-head Do America." The prickly pair became an icon on MTV, which celebrates its 20th birthday with a special telecast from New York's Hammerstein Ballroom Aug. 1, 2001 at 8 p.m., EDT. (KEYSTONE/AP Photo)