Check out http://yarn-monkey.blogspot.com/2006/07/are-you-ready-for-sock-wars-2006.html
The gist of the game is that you race your "target" to knit a pair of socks. If you get them your socks first, they're "dead" and they mail you their semifinished pair plus the name of their target, and on and on. Last one "living" gets a prize. (Everyone else gets the socks that killed them. )
It's like knitting Assassins!