Cliff diving is a cool way to piss people off on quakeworld (quake world) servers. Step 1: Type bind "some key - I use G" kill. Step 2: run around the level, picking up all the good powerups. The run to the nearest drop off, jump, and press&G (or what ever key you bound kill to). If you are fast enough, you can see your self falling. BTW, don't let yourself be killed - you wouldn't want the legitimate players to get those goodies....