Search "Bug" into bungie.net's file share. It shows all the bugs that have come up when people view their games in theatre. So far I've seen all the noble six helmets, include Masterchief's helmet and things like EOd and CQB randomly show up on peoples' spartans. Also lots of other pieces of armour.
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.