This is a how to easiest way to get the stun and flash grenade challenges.. basically all you u do is stun or flash your self!!! this video has no reason but just to make a point.please rate..thanks ill be posting more MW2 how to videos as soon as i make them u can ask questions and ill post them. the map on this video is trailer park its part of the new map packs out i have both of them ill share just add redrumm666 thanks youtube!!!