Yeah, my mouth was literally agape when he started, and I kept smiling bigger for all three verses. Oh man, this 80 hour series playthrough just to ready me for ME3 was so worth it.
I guess I always motored through the latter part of the game, which is why I've never encountered it before.
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Yoblazer: http://oi52.tinypic.com/ad21i1.jpg
Watch and you'll see... SuperNiceDog own me... in the Guru!