I really wish I had some way of capturing on video what happened tonight.
**campaign spoilers for those that care **
I was on the level towards the end of the game where you are in the group of three russians rushing up the hill to captures that guy.
I'm running up the hill and get the sniper rifle to cover my two buddies. Shoot one guy, shoot another, third guys runs around a planter and I head shot him and he shoots right up into the air. Just gone, like he was sucked up in a vacuum.
I shoot two more guys and get ready to get on the steps and his body lands behind me and scared the crap out of me.