Ep 3. The More You Moe, The Moe You Know

In Adventure Time season 9 episode 3 titled "The More You Moe, The Moe You Know," Finn, Jake, and BMO discover an old video diary belonging to Moe, who used to be the owner of the Tree Fort. The diary contains footage of Moe teaching BMO life lessons, and the trio realizes that Moe was much more than just a grumpy old man. In an attempt to recreate these lessons and honor Moe's memory, they decide to throw a party for the entire Land of Ooo and teach everyone how to be better people. However, things don't necessarily go as planned, and the group learns that learning from the past doesn't always mean that history won't repeat itself.