People in Washington DC walk up and down escalators.
  This surprised me when I moved here in 1989. I was a
  rather wide-eyed small town kid, just graduated from a
  cozy Pennsylvania college, and much of the city both
  amused and scared me. But there was something different
  about the escalator people, something robotic and a
  little scary. It wasn't just all the suited, briefcased
  grown-ups pumping up and down, rejecting the quaint
  promise of a free ride, but more the finality with
  which it was done. Walkers on the left, standers on the
  right. No exceptions and ignorance is no excuse. Make
  your choice and stick with it.