Naked Man in San Francisco Subway Alternates Between Fighting People and Doing Gymnastics

We see some pretty crazy stuff in the New York subways, but this video from San Francisco's BART (Bay Area Rapid Transit) system might top them all. In it, a naked man runs amok inside the train station, alternating between attacking passengers (which can get pretty scary at times) and doing some really impressive gymnastics.
(Warning: occasional penis. for real oh)