(CNN) -- Editor's note: The video contains graphic content The video is bizarre by any standards.
In it, a glistening man with a wild head of hair turns fare gates into balance beams at a San Francisco subway station, stretching and doing back flips buck-naked.
Commuters flee as he dashes across the station, attacking people at random. Whimpering, they run for cover in a station agent's booth.
The incident took place at a BART station in May -- but the cellphone-shot footage was posted online Tuesday.
And as such videos go, it went viral -- quick.
"It happened over a month ago," said Alicia Trost, a spokeswoman for the Bay Area Rapid Transit, which operates the route. "This is the first time anyone has seen video."
It took seven minutes for police to arrive after a station agent called for help, she said.
"Police, hurry up and get here, please," a woman is heard muttering in the video as the man runs amok.
Authorities arrested the man, 24-year-old Yeiner Perez, for attacking a passenger and a transit employee, and took him to a hospital for a psychiatric evaluation.
After that he was released.
Police charged him with misdemeanor battery.
Also, Trost added, "We're requesting an order from the district attorney to keep him off BART property."