The one I like the best is the one I got from watching those pro tournaments:
Charged plasma pistol and a whack to the head.
It always pissed my cousin off that I could sneak up behind her and get her 10 times in a row. Even though she had the sword and rocket launcher the whole game.
This is the best halo theme... EVAR! Is he made of midgets or something? cause that was awesome.