After starting the day by raising the Sun, Celestia was sure that nothing could possibly ruin her day. Unfortunately for her, something had happened to her sister. She really thought Luna would have learned after the last time.
One morning, Princess Celestia woke up as a giant spider. She did not appear to be particularly concerned by the news.
Celestia thought she knew her sister like the back of her hoof. An incident with a changeling revealing spell was about to make her deeply question that belief.
Upon waking up one day and finding out that she'd become a spider, Celestia had reacted in a surprisingly calm manner, simply deciding to inform her subjects of the fact. Chrysalis, unfortunately, had not been among them. It disturbed her greatly.
Suspicious about her actual relation with the rest of her family, Apple Bloom had some tests done in secret. The results were... unexpected, to say the least.
After finding the Elements and turning her friends back to their old selves, Twilight was ready to confront and defeat Discord. Until she twisted her ankle.
Celestia is a spider. Celestia remains a spider. And we-Well, we didn't really have anything to do with it, but we're still the ones who have to suffer the consequences.
Chrysalis coming to her to ask for friendship was something Celestia always hoped would one day happen. She did not expect things to go like this though.
Traditionally, in Equestria, the carpet matches the drapes. And when the drapes can't be matched, there's no carpet. Unfortunately, Celestia forgot to mention that detail to Twilight.
Saying he didn't like Princess Luna after she was dead had probably not been one of Blueblood's smartest moves. Neither had jumping out of the window shortly afterwards, once he really thought about it.
In order to become a better actress, both because it was something that could be useful to her and something she wanted to learn, Celestia bought a private lesson with the best instructor she could find. She was not expecting her to be who she was.
Having discovered the true nature of Apple Bloom's origins, Luna decided it was necessary to take action in order to prevent the potential consequences. Things did not go too well from there.
Death wasn't part of Twilight's plans for the weekend. Twilight was part of Death's plans for the weekend. Neither had foreseen someone else arranging a compromise.
Having managed to escape from her prison, Chrysalis decided to follow the advice one of Celestia's guards had given her and booked an appointment with a therapist.
Following her therapist's advice, Chrysalis decided to invite her parents to a reunion and finally talk to them. She may have confused the definition of inviting with that of abducting in the process.