Tapping
Well this is pretty old but eh i guess ill post it again.
Sorta like an OPK but no hack
1. Hide in some spot and unplug ur ethernet cable on ur modem
2. go run around and shoot some1 in the head about 2-3 times
3. after ur done plug the cable back in
4. HeadShot, Ultra Kill LoL
Note: You have to restart CA after doing this and sometimes it may not work and u must do it under about a minute or u will get DCed. You can die while u are tapping and if the enemy is dead while ur ethernet cable is unplugged u will not get the kill
....umm ok there is not point to this because you do not even get points for the kills and plus it just stays frozen...
Yeah I do this sometimes. Problem is that when you go "kill" everybody and you think you are done, some of your teammates have already killed the enemy. So an advice would be to hide close to the enemy's respawn, but not too close or they will find you.