On GTA IV, we used to do the ultimate dick move. One of us would repeatedly kill the other and another random player then the one repeatedly being killed would try to form an alliance with the random to kill the killer. The killer would then jump in a boat and go as far out on the ocean as possible while the other one grabbed a helicopter, picked up the random and flew out to get the killer. Instead of killing the one in the boat, the pilot would ditch the chopper miles out then get picked up by the one in the boat leaving the random stranded and left to swim for 5 minutes or so back to shore, at which point we'd shoot him.
Had many a death threat in my inbox.