While I've been online for a bunch of years I am always fascinated how offline ideas, now used online, work.
My favorite one, that I recently discovered, is this virtual waiting list for a newsletter. On the example below, 60k+ people are supposedly on the waiting list. I guess it is more difficult to get this very important newsletter than meeting the pope!
But that's not all. Like in real life, I can be an ahole and jump the waiting list. In this case I can tweet FB or do other stuff to jump the line. I wonder if you could reverse engineer that and bring the same waitinglist and gamification concept back to the offline world.
Anyways..if you are interested in doing the same, Waitlisted does it for you.