The entry for calling shotgun on Wikipedia. There are almost 60 special amendments to the "official" rules, including "Amendment IX: Australian Shotgun. Originally from Australia, if two people tie for shotgun, then the first person to put their thumb on their head is awarded shotgun. If they both do this at the same time, then an immediate pissbolt (race) to the car is required." (via zach, who says "best Wikipedia entry ever?")
...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.