Bungie has hidden secret Ninja Gaiden items in Halo 3, and here are the first shots of them in the flesh.
Players who've already put too many hours into Halo 3 are running around wearing a Hayabusa-style helmet with a ninja sword on their backs. And it's causing a storm in the forums...
The sword isn't a usable weapon - so don't get too excited - but it looks cool. And all you have to do to get it is earn all 1000 Achievement Points. So that means you need to locate all the near-impossible-to-find skulls and the helmet is yours too. Easy that!
Maybe this is why we hear loads of people asking other gamers to help them get multiplayer achievement points BY CHEATING? Shame on all of you! Getting the Overkill achievement will happen in its own good time...