Last weekend

police released surveillance footage of a man accused of groping a woman from behind as she boarded a train at the Broadway-Lafayette subway station and asked for help identifying him. According to a NYPD spokesperson, the system works: a tip came in and 50-year-old Staten Island man Samuel Mangum was arrested.

Luckily, the victim was uninjured after the assault. Mangum's been charged with third-degree sexual abuse for the alleged attack, which occurred on November 10. Subway perverts beware: if the camera doesn't shame you, the victim will.