Dreaming Grunt
From Halopedia, the Halo wiki
The Dreaming Grunt is an Easter Egg featured in Halo: Reach. The only 'known' place to find this egg is in the level Nightfall, and go up to the place where the Grunts are sleeping, occasionally an Unggoy while say in his sleep "It's funny but I dream in English]].
Trivia
- This is the only thing that Grunts say in English in Reach.