"Friendship is an island that you retreat to. And you fall on the floor and laugh at all the ninnies who don't have enough brains to have your good taste." --Ray Bradbury
Mister Lonely Heart is a self-styled "Grievance Counselor", a changeling who mimics ponies that his clients have issues with. When Twilight Sparkle pays him a visit, he finds out how painfully neurotic the Princess of Friendship really is.