When I was trying to get the IWHBYD skull I fell and I ened up in a garage and when I steped out I was walking on nothing! First I was walking on buildings and I got to the pelican checkpoint (Where if your trying to get the skull you jumpp down on the ramp to see the pelican fly away) there is a small space between the building your trying to jump to and the rail. Fall in the space and keep on walking.You should end up in a sort of garage.

Sign on Zanzibar
On the beach on Zanzibar, you will see signs that say NO SWIMMING. Well, go to your xbox dashboard, go to the Settings, Clock, and change every number you can to 7 , then pop Halo 2 back into your xbox and load it up. WARNING: Do not sign into XBoxLive, it resets your clock. Now go to Split-Screen and start a game on Zanzibar. Go to the beach and look at the sign, it will mention something is missing, and there is a bloody dog's head.