"sam"? Surface to Air Missile?
I managed to scare players on the opposing team into near submission on the AVP demo on my 360. It was quite good fun...There were four of them, I kept hissing and moving around on the roof around the corner. I heard them through my headset they were like "OMG WTF WHERE IS IT?! WERE GONNA DIE!!" One actually took off screaming and shooting randomly, after theat I moved in and slaughtered the remaining three with a tailwhip for an entry and a backattack for a finisher. The third guy managed to get shot by his friend while I attacked them.