It seems like every year Princess Celestia has a 'mid-life crisis' that plagues her terribly. A night where she locks herself in her room and thinks hard about her life's choices. With nothing but a bottle of the finest wine and her dangerous mind, she delves into the more darker reaches of her thoughts. And each year since her sister, Luna, returned, Celestia only gets worse.

Disclaimer: Usage of light profanity and alcohol, but not enough to require a tag in my opinion.