The Skullhead stunt is a Miscellaneous stunt that involves floating the oddball on an invisible ledge at the exact height of the Master Chief's head.
- Get the oddball on the bottom floor and walk to the teleporter that doesn't have debris in front of it.
- This debris is a big gray piece of metal that takes up half of the walkway.
- Go to the left pillar that connects to the slope that has the little piece of debris in the way.
- Stand in front of the smaller debris and look slightly to the right of the corner of the slope and walk about halfway down the slope.
- Jump and press the "Fire Weapon" button to toss the oddball and get it to land at head height on the invisible ledge over the slope.
- You will have to find the right time in the air to throw it and the correct space to jump from.
- Once the oddball is at the correct height, charge up a Plasma Pistol and line your head up with the oddball.