Pinkie Pie's abilities have confused ponies for as long as she's been around. Her very existence is an oddity, and maybe there's a reason for that after all.

From the strange way she showed up to her parents, to the moment something went wrong when Twilight practiced a new kind of magic around her, Twilight has found one thing consistent in her new studies of Pinkie Pie:

Things are not always what they seem to be. Neither are ponies.

Taking place one month after the events of the movie, Pinkie Pie and Twilight's relationship has been especially strained after everything that happened. Pinkie has been pretending that everything is alright, but Twilight notices how her pink friend takes extra caution in speaking to her lately...and how she eyes her horn warily every time she does magic. Eventually, Twilight finally manages to confront Pinkie about her strange behavior, only to find out that her actions had scarred the party planner more than she could have guessed.