Celestia, as the castle knows, as Equestria knows, is dating Discord. They, occasionally have a small fling every once in a while, but it just turns awkward afterwards. All of it, because of Celestia's inability to do it properly. Now, with a self-help tape, she plans to solve that. Unfortunately, Discord finds it and decides, unknowingly what it is, to switch it with a guide on how to cook a turkey.
Hopefully she uses butter instead of oil, otherwise that would just be weird.