Here is another one of the MTA's stupid "service announcements". Now, my Spanish is a little rusty, but I believe it says:
This is not a Dance Club.
Keep the stairs clear, jackass.
75% of people spontaneously break out into lame 1970's John Travolta dance moves on our staircases while heading for the train. This causes people to stop moving and put sunglasses on. We're concerned for your health. Your mental health.