Grogar, the Father of Monsters, retrieves his Bewitching Bell which was sealed on top of Mt. Everhoof. Once he reactivates his long-lost artifact, the Bell awakes itself and beholds its old master and friend. They have a strong connection which not even the Treacherous Trio would understand or grasp. Both the ram and the Bell have plenty of secrets to share as they have their first one-on-one conversation after so many years of absence from each other.
(Note: This happens after MLP:FIM season 9 episode 8 “Frenemies”.)