The Sleeper Car: on a Sunday evening, they transformed a New York subway car into a "sleeper car" complete with beds, complimentary pyjamas, earplugs, sleep masks, and a courtesy wake up nudge at the passenger´s stop.
As you have probably deduced from the amount of videos posted here, I am a big fan of this group. I find what they do just great, and their pranks make me envy New Yorkers even a little bit more.
If you want to see any more of their scenes, click here.
As for English practice, watch the talk given by Charlie Tood, the creator of "Improve Everywhere." Remember to choose the subtitles in the language of your choice - I would recommend English, but if it is too hard, click on Spanish or Galician.