A truly brave human being saw something while riding the M train through Brooklyn, and decided to say something to Gothamist (with NSFW video): A depraved man decided to whip his dick out and masturbate on the train. He didn't do a very good job of concealing himself, either. The aspiring exhibitionist, however, is a little shy: he brings the show to a halt when the train reaches a stop. Gothamist has turned the video over to the NYPD.

[H/T Gothamist]