Odd One Out. "Halo" and "comedy" are not words that tend to come together. This manages to pull it off.
in the Duel, the Arbiter takes down an entire covenant army by himself, as the battle ends he gives a Thousand-Yard Stare to the battlefield...then suddenly a grunt runs in while screaming "HE'S A DEMON!" in a high-pitched, nasal voice. the Arbiter nonchalantly offs him.