No Joke: Watch Conan O'Brien, Andy Richter Voice Halo 4
The best part of the segment is when Conan and Andy are actually in the studio recording their heavily improvised voice-overs. They play on the lameness of the roles with comments like "I sure hate my life," "I'm sorry, I didn't hear what you were saying -- I was peeing in my suit," and "This is a pretty sweet union we're in: stand near the crates but don't ever move them.