I know, I know. By now, you've had your fill of different people doing their own "Gangnam style" videos. Even Psy says he's sick of that song.
But just in case, you haven't had enough and you want to see a guy who can dance do "Gangnam style" at various Chicago sites, check out this one.
The man wears an Amtrak uniform through much of the video, though I haven't been able to confirm if Amtrak was the one that organized this. Doesn't really matter one way or another.
Nod to Gaper's Block and Via for finding this.