Headless Master Chief
From Halopedia, the Halo wiki
The Headless Master Chief is a glitch that can be done at the beginning of the Halo: Combat Evolved campaign level The Pillar of Autumn. The glitch causes a headless Master Chief to appear inside of a cryo-tube.
Tutorial
- Wait until the Chief step out of the Cryo-chamber.
- A split second after you come out, jump back inside the cryo tube.
- You should then see the Headless Master Chief.
Sometimes you will be pushed out, but if you look inside the tube from a certain angle, you will see a headless Master Chief. Also, if you jump on the cryo tube, you might fall into the small space behind the cryo tube.
Video Walkthrough
Another way is to crouch jump into the cryo-chamber (see video); this way, you will not need to look at a certain angle -- you will see the oddity front on. The only downside about this is that once the lid on the cryo-tube has closed, you are stuck inside it, and you will have to restart the level to continue, though sometimes, jumping inside the cryo-chamber can fling you out and let you continue the game.
