Pinkie Pie is having an odd day.
She can't find any of her friends. Which is worrying, because she's friends with every pony in Ponyville.
Instead she keeps running into... herself?
Where'd all these other Pinkies come from? Why do they have numbers instead of cutie marks? And why does everypony insist that things have always been this way?
(Borrows some themes and ideas from The Prisoner, but not a direct crossover and no knowledge of the show required)