You can kill a guy hogging the teleporter in multi. When you teleport you need to walk some distance from it before you can go back, if you do not you can walk behind the green screen and just stand their. Anyone that tries to go in can not teleport, thus denying them whatever weapon is on the other side or shooting you in the back. But you can do something about the guy who is just stand their. Just walk into the teleporter, you should not teleport, but if you stay their his screen starts going white then he dies and you pop out the other side, and on his screen it says "You have been Telefraged".
Note: The teleporter used for this must be conected to each other, one has to be tele. A and go to tele. B and back.
This is so funny when someone who is not expecting it and they panic when their screen goes white then they die, look at their face, then laugh at them.
So their is that secret weapon everybody says does not exist... the humble teleporter with a 1 hit kill.