What happens when a Changeling hears about a night when ponies dress up as other ponies? Well, she gets really ticked off. After getting a plan, and a good disguise, she decides to have some fun with Ponyville as...
Nightmare Moon! At least, that's who she's supposed to be...

Everyone's writing Nightmare Night stories, so I thought, "Hey, why not?" This is my first story with the Comedy tag and the Everyone rating, so I hope I did a good job!