Rarity's Costume

So what happened to Rarity during Nightmare Night anyway? I present my humble speculation: Rarity was there the entire episode! She was dressed as Sir Not-Appearing-In-This-Film, of Monty Python and the Holy Grail fame. Thus was this picture born.

With all due apologies to the creators and owners of My Little Pony: Friendship is Magic and Monty Python and the Holy Grail. As usual: Please no sue.