Halfway down each subway platform in New York City hangs a black-and-white striped sign. Before opening the train doors, a conductor is required to point at the sign to acknowledge (for safety reasons) that the train has fully arrived in the station.
If you're a New Yorker and you bought a MetroCard sometime in the last week or so at a "high-traffic" station (Herald Square, Penn Station, Coney Island, Times Square, etc.), you may have noticed something was very different. Rather than the sunny yellow New York commuters have come to know, the card the machine spat out this time was crimson.