Today while playing Gears of War 2, I was on an Annex match at Blood Drive, one of the lamest Annex maps.
I had the sniper rifle and was running to the flamethrower because that's where the hill was. But it's tough to use the sniper on that level since it's a mainly close-range-battle level. So I stopped underneath one of the grenade windows. I turned around to make sure no one was following me. Someone was. So I left-triggered (didn't zoom farther than that) and popped off a shot at the roadie-running locust, hoping I could injure him and then melee him down. Instead, I shot him in the head and his body dropped.
Then another guy rounded the corner, just in time for me to active reload and try the plan again, shot-in-body-then-melee. I left-trigger headshotted him too. I spent a few seconds after that looking at the two headless bodies before me and feeling pretty badass.