had one of the sickest finishing moves yesterday... I was playing invasion, on the spartan's side, when the got to the staircase with the core, about 15 seconds left. I jumped on the elite's back, beat him to the ground, then jumped up and landed both feet on his head in a nice, big "take that B!7C#" kind of stomp. Needless to say, that last move was all it took for them to lose. I'll see if I can't get some video or pics of it.
Also owned someone with a no-scope headshot on Sword Base. These probably aren't stupid screenshots (other than making the other team look dumb) but from the right angle the could look pretty funny.