Holding onto the outside door of a train and letting it drag you is called skylarking -- at least that's according to the New York Metropolitan Transit Authority. Urban Dictionary defines it as engaging in "tom foolery or shanaghins." To others, what you'll see below is probably just called being stupid.
Watch as these kids go "skylarking" and then proceed to take on other dangerous, monkey-like moves on a fast-moving train:
A Blaze editor also noted that he recently saw an anti-skylarking ad -- though he noted it wasn't referred to as skylarking -- on the New York City subway system. Is it on the rise in New York too?