A prank on Celestia that involves a gallon of vanilla pudding goes awry. Flame's prank reveals a pony to be a Changeling. A rather ditzy and goofy one to boot.
Flame: Secretary, prankster and Celestia's personal assistant (and pain in the flank).
Mints: Changeling, born with four left hooves, might have a crush on a certain personal assistant (and pain in the flank) of Celestia.