Go to the crash sight level,and walk out the first door. jump on top of the light above the door you cant open and then crouch jump on top of the roof of the building. look aroun the top of there for a bit and ull find the blind skull. pick it up with x and ur guns , sheild bar, amo , and gernades on the screen will be invisable.Its anoying when it does happen after a while but if u turn ur game on and of it will go away. its kinda kool to c though and its worth doing once