I had an awesome run in the PLAZA level last night. Only because I killed the same guy five times in a row. I usually set up shop on the roof of the store near d'BO in TDM.
This sniper was coming to flush me out but I got him, then proceeded to know exactly where he'd be coming from and killed him five times straight. I was howling after the third time. Stupid me only died when I set up the sentry gun and forgot there was an open door behind me...