skull in halo3

i was playin halo with some friends and i have already colected the 13 skulls but on cortana there is an extra skull
when u are in the room where you blow up the 4 machines after rescuing cortana if u dont leave fast enough u get shot up on the edge of the room. there is a skeleton with a skull u can pick up??? no acheivement or anything but anybody got any idea?

I'm afraid I can't help you, I'm far too much of a fag.  If anyone on here isn't a huge fag, maybe they can help you.  If no one helps you, I would presume, if I were you, that everyone who didn't help you but could have was too busy thinking of potential cocks they would like to suck.

yum, penis.