I am a Geek and this will certainly cement it for you if you didn't think so.
A few years ago I came across a dollar bill with a stamp saying-
Track this Bill
When I went to the site I found out it is basically a bill tracking site. You enter the bills serial number and if it is already stamped that usually means it was already entered by someone else. You will first log it's current location by zip code and second be able to see where it came from. This interests me in some weird way. I wish more people logged as I have a few bills that have traveled for over a year and ended up only a few 100 miles away. True George people keep track of how many states they have a hit from or if they have a hit from each federal reserve. I am not that in depth I just think it is neat.
Some of my Geo caching friends may find this cool and the rest of you are just going to be left shaking your head.