My current coworkers are pretty cool, except that some of them have the annoying habit of IM'ing instead of walking ten feet to talk to the person in the next cube.
Former coworkers, now... there was the guy who would sneak up behind you and try to catch you surfing the web on company time
, the girl who yapped incessantly on her cell phone at top volume, the guy who spent all his time in the bathroom, the guys who blew off an entire afternoon of work to go get drunk
(actually I'm only mad at them because they didn't invite me 
) and some
very inept managers... but that's another thread...