Faking Brutes

The Faking Brutes glitch is a character animation error found in Halo 2. The glitch causes the corpses of some Brutes to blink their eyes after being moved.

Sacred Icon
Sometimes, when playing Sacred Icon on Heroic, you may find a Brute's corpse near the plug locks, in the area where you fight an Enforcer. When you deactivate the containment shield and the platform you are on begins to move, look at the Brute's eyes. They will occasionally blink.

Sputnik/Melee
If you have acquired the Sputnik Skull and can find a body that blinks (namely Brutes), melee the body and look closely at the eyes. The resulting movement may cause the body to blink.