Video that explains Dungeons and Dragons to the uninitiated

This Vox video that explains Dungeons & Dragons (and, to some extent, role-playing games more generally) is pretty good. I especially liked the discussion by the participants about why they play the game (8:00-9:40).

Next time I'm asked by a non-RPGer to explain the hobby that has been a disturbingly large part of my life since the age of 10, I may simply refer them to this video.