Final Grunt

The Final Grunt (one of the Talking Grunts, often called the "Jerk Store Grunt") is found cowering on the edge of a cliff right before you go down the ramp to leap into the frigate's hanger in the final level of Halo 3. When you're at the top of the ramp leading to the Dawn's hangar, you should be under a rock arch. If you get out while under the arch and face the Dawn, to your right is the Grunt. You should see him. If the player approaches him, he will say:

"Hey, Demon! The jerk store called, and they're all out of you! Poor you, stolen at the age of six and conscripted into the military, waaaaaah! ...Okay look, if you let me live, I got the Fist of Rukt. Look, I'll be the bomb. I'll polish your boots. I'll polish your helmet! It's the gas, haha! When I'm on the gas, I don't know what I'm doing half the time!"

However, discovering the "Final Grunt" may leave the player unable to complete the end of the level and the game, because there will be no route available to reach the Forward Unto Dawn since the platforms may have broken if you aren't quick enough. Also note that if you drive up to the Grunt in a Warthog with the Arbiter at the gun, he will shoot and kill the Grunt before you can reach him. Make sure you keep the Grunt out of the Arbiter's line of sight, or the AI Arbiter will kill him.

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Trivia

 * The Final Grunt is also known as "The Jerk Store Grunt".
 * The "Jerk Store" joke is a reference to a joke on the American sitcom Seinfeld.
 * If you kill this grunt it will not make its speech despite other sources.
 * This easter egg has a striking relationship with the last level of Halo: Combat Evolved. In the last level, The Maw, it is possible to find another talking Grunt that won't attack, the Thirsty Grunt. In both cases, stopping to listen to the Grunt may cause your death (it is possible to survive hearing the Thirsty Grunt on the lower difficulties, as you have more time).
 * "The gas" might actually refers to the methane gas that the Grunts breathe. However this would be unlikely, as they breath it as we breath oxygen. It is more likely he was running out/had run out of methane, and was breathing oxygen and feeling lightheaded.
 * While playing the meta-game if you drive close enough for the Arbiter (or a co-op teammate) to shoot and kill him you will not gain the points earned for killing a Grunt. The same goes for other "ambient" AIs e.g. Wounded Marines, crying Marines, Technicians, etc.
 * With the IWHBYD (I Would Have Been Your Daddy) skull on you can hear normal grunts say this on other levels.
 * Also, if you play on Co-op, the Grunt can talk to the Arbiter, too.
 * The speech refers to when John 117 was taken and became a Spartan. Read about this in The Fall of Reach novel.
 * The Final Grunt is the last Covenant foe you meet in Halo 3.
 * This Grunt is a normal Grunt and nothing is special about him besides the fact he's the last foe you encounter on Halo 3.
 * "The gas" might be referring to Benzene.

Related Links

 * Thirsty Grunt
 * Cowardly Grunt