[TUT] Unlimited Monkey Bombs on Zombies

Tutorial:

1) throw all your monkey bombs so that you have none
2) Throw down the frag grenade near you
3) Now go over the frag grenade until you see the "throw back frag" indicator
4) Now press the L2 button as if you're throwing a monkey bomb.
5) You now should have thrown a monkey bomb instead of throwing back the frag. Voila

BTw, this also works if you want unlimited tactical grenades such as nova gas, stuns, flashes, etc