It is Nightmare Night. The annual party - hostessed...ed(?) by Pinkie, naturally - is in full swing. There's dancing, games, snacks, happy ponies... the whole nine yards. Possibly even TEN yards. While touring the crowd, Pinkie sees a strange glow and hunts it down, finding somepony dressed in the most realistic ghost costume she'd ever seen (if she'd ever SEEN a ghost, that is - odds are it would probably look a lot like this if she had).
When midnight comes and all the costumes drop, who will this mysterious figure end up being?