Disappearing Truth

Disappearing Truth is a glitch that can be performed on the Halo 3 campaign level The Covenant. It is a physics-related oddity that sometimes causes the Prophet of Truth's corpse to fall through the ground.

Tutorial

In the last section of the level The Covenant, after you have reached and killed the Prophet of Truth, you can melee (or teabag) the Prophet once, causing him to fall through the platform on which his body rests. Note that the area in which Truth resides afterward sort of resembles a tomb, a final resting place for the Prophet. When he falls beneath the platform, you can see him, though you cannot reach him or get him out again. You can also Teabag Truth OFF the platform if you do it quickly, this is easier if toggle crouch is on, go near the head of truth or near his legs and quickly teabag him while slowly moving off the platform, this is easy to mess up. If done right he will go off the platform with you down the stairs, and can be dragged along if the glitch is continued. If messed up he will fall through the platform like normal but will end up in a different dead position, sometimes ending with hilarious results.

Sometimes, the glitch causes Truth's hand to wiggle.

This also works on the Flood Combat Forms if you manage to kill them on the platform and subsequently melee/teabag them without destroying the body.

Explanation

This is a glitch in Halo 3's physics engine, and can be seen throughout the game if enemy or friendly units are killed in certain ways, or are moved to certain places using the melee attack. Another common physics glitch is when units are killed while falling; it causes their bodies to flail about for an extended period of time upon landing.

It may also be related to the "dead reflex" that Bungie added to teabagged bodies.