If you've followed the story of Discord Whooves, Time Lady Ditzy shares a bit of the story. Within this short story, she takes on her very first enemy. The homicidal Pinkamina Diane Pie.
Warning to all viewers:
This short story is incredibly violent as it spawned from the negative feelings I experienced during a short day of depression. If you find the idea of cute ponies murdering one another disturbing, turn back now.