Don't know if you guys know bout this glitch, but it works. The crouch with a nade glitch! If you have a he grenade in your hand and your couching you CANNOT get hit in the head! I've tried this multiple times and it does work! I think its only CZ version and 1.6. Havent tested it in Source, since the whole aiming system is junk there. The easiest way to do it is turn ff on and try with a teammate. I've showed this trick to many friends and they use it wisely behind boxes that show the top of heads. You can even stand point blank and shoot an entire clip into a head and not do any dmg! Shhhhhh, not everyone should know this.