I've walked over the bridge really late at night a few times and wondered if I'd ever see someone doing something like this...

Last night an unidentified man survived a suicide plunge from the Brooklyn Bridge after threatening police officers who were trying to talk him down. The 38-year-old man was approached by cops around 10:30 p.m as he clung to a girder about 35 feet away from the tower on the Brooklyn side. After waving a knife at them, he plunged to the East River, at least 120 feet below. Rescuers pulled him from the...

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http://gothamist.com/2009/08/05/man_jumps_from_brooklyn_bridge_surv.php