Rainbow dash: Applejack we think you might be going mad with power over this newly turned into a unicorn thing. Applejack: what are you talking about? I'm fine. Now if y'all are done here I'm going to go make my apples dance.
Interesting concept; suppose in an upcoming MLP FiM episode, a 'Twilight Special' spell goes wrong and ponies are switched around; Peggy wings on Rarity, RD an earth pony, AJ as a unicorn? Shoot it over to Lauren Faust and see what she says (could be a hoot)