How would a being like Discord want to be remembered after he's gone? Well, if you're curious, he did actually write a will. To the surprise of nobody, its contents are bizarre and mildly disturbing.
When Discord is reformed by Fluttershy, he returns to Canterlot along with Celestia to review his marefriend. Discord realizes that although Luna is happy to see him again, she is sad about what she did in the past.
Celestia realizes that Luna is very sad after Discord's petrification. Celestia, concerned for her sister, she is determined to discover the reason for Luna's sadness.
After returning from her latest trip to the human world, Twilight confronts something about herself that she isn't prepared to. (Friendship Games spoilers)
A week ago, Twilight valiantly assisted her friend Fluttershy by detaining a wonderful and fair mare just doing her job trying to make ends meet. She didn't honestly think she was getting away with that did she?