One of the most distinctive features of any city is its mass transit system. Metro cuffs featuring the subway lines of random cities is a great way to tell the world that you are well traveled, or to remember transit hijinks from your random vacations.
I just arrived in San Francisco yesterday and managed to go the wrong way on a train. It seems every time I think I have a transit system down pat, the transportation tranny gods reach in and smack me back down. Still, some of my best adventures have come from going off the beaten path, so a metro cuff would be a great way to remind me of those, and also that I don’t know everything.
Paris[ via ]