Halo 3: Now with anti-moron feature!
Oh, this kid. I almost forgot about this miserable, horrible, awful, should be lobotomized and sterilized and sold a sweatshop little boy. Ugh, makes me want to get my tubes tied right now. What you're seeing/hearing is the live headset microphone feed from the kid's Xbox Live setup, recorded by another player in the same match. Yikes.
At any rate, Halo 3 will now feature an "A**hole button" - a feature that allows you to select a player who you'd love to hear less from, and mute them for the duration of the match. Great idea. Especially when there's little turds like the star of the video above on the loose...