in MW2, when you're sniping and you see another sniper looking RIGHT AT YOU, and you get the first shot in (the only shot if you're playing HTDM).
i confess though, i get spooked and i rip my sniper rifle frantically trying to get a hit, so i just end up putting pressure on the enemy hoping his bolt action will miss, and buy me some time, or he'll take cover so i can move to another firepoint.
