There's something that waits in every bedroom, every hallway mirror, every bit of glass, every silvered or polished metal surface. Something that looks back at Pinkie when she looks at her self in the mirror.
And this, too, is Pinkie Pie, and she's just so happy you're here.
(An entry in the twenty-third Quills and Sofas speedwriting competition. Prompt: 'Mirror, Mirror' from The Big Friendly Giant OST)