"Friendly" Brutes

The Friendly Brutes is a glitch that can make the Brutes, regard the player as an ally and not attack him on sight.

How to do it
On the Halo 3 level, Crow's Nest, where Miranda Keyes, Sergeant Johnson and Thel 'Vadamee are aboard the last Pelican dropship leaving the base, before the battle finishes, set a deployable cover outside the door that the second wave of Jump Pack Brutes emerge from, blocking their way. Kill the Brutes that are already present, and return to the deployable cover. Take down the shield, though do not destroy its base, and you are able to enter the room until it regenerates. The Brutes present will no longer regard the player as an enemy and though they will look at the player, they will not attack. If the deployable cover is destroyed, they will continue outside the chamber and will regard the player as an enemy. This is also possible on Tsavo Highway, before the first tunnel. You must kill every enemy (including the Drones) and then go into the tower near the cliff. The brute that is up there will usually leave you alone. This only happens on easy or normal.

Note

 * This will work with other brutes in other levels, and may also work with other enemies.
 * It is unknown why it usually works on Brutes.