Oxhorn's seasonal shorts always seem to bring a little something extra to the holidays. He's hit Halloween just in time by releasing Dalaran's Costume Contest. If you can't see the YouTube for some reason, you can also pick it up over at Oxhorn's official web site.
As the story goes, Oxhorn's usual cast of characters are competing in the Hallow's End costume contest. They spend a little time discussing the event, when Hat (the singing turtle) comes up and reveals his own clever disguise. I can't go deeper into the story here, or I'll ruin the punchline. And while it may make me a pop-culture junkie, I admit that I laughed out loud at the joke.
An odd bit about this video, though, is that Oxhorn included almost a minute and a half of outtakes. I actually kind of love that stuff, since it gives a lot of personality and "humanity" to the actors in his machinima. I think it lets the audience get to know them a little better, which is almost always a good thing.