EtherKiller and Friends
I was browsing around slashdot.org and came across a post that linked to fiftythree.org. It's one of the most hilarious sites I've been to in a while, but you can only really appreciate if you know the technologies that he's trying to kill.
My favorite entry:
BNC-Killer
"BNC-killer" makes the center pin hot. For added fun, connect to any remaining thinnet in the building to make sure everyone has switched over to twisted-pair like we told them to. Next time they will listen.