OMFG HAXOR (one shot headshots)
Ingredients:
1 Deagle (or glock on burst fire)
1 Bullet
1 Corner/Doorway/Something to hide behind
1 Guillible Victim

If you get into a close combat gun fight and like me, have sprayed away all your precious bullets and haven't done any damage... Hide around the nearest corner (etc etc). get right against the wall with the cross hair just off the wall facing the corner (etc etc). 9/10 times the person you are fighting will reload and come after you, everyone wants that kill after all. Aim roughly where you believe head height is, this comes with practice (olaf suggests bots on easy). The second you see the gun come round the corner... shot over 50% of the time you well get them with the first bullet and if not you've got an advantage over the enemy, because unless they are aiming at you through a wall you wil see them first.

Don't try and do it to me though, I won't fall for it.

And my fast reactions..... come from Red Bull, A bit of caffiene never hurt anyone (don't prove me wrong )