As somebody who used to get off at this station every other day...
...this is far from the weirdest shit that I've seen happen in a Bart station. Can't say I'm surprised.
A few years back, some dudes jumped on top of one of the trains at an Oakland station, wearing full cowboy gear, and were having a fist fight... and they were only wearing banana hammock thongs under their assless chaps.
Another time, at the Pittsburg bart station, some dudes brought a scanner or a printer or something into the lobby, threw it on the ground, and started beating the shit out of it with a baseball bat... basically re-creating the scene from Office space... while one dude just stood there with a boom box playing the song from the scene. They then just walked away like nothing happened and left that shit there in pieces.
Have a nice day, Bluename.