In Animal Parade, if you marry the Harvest King the Sprites need to explain to him what a "smooch" is. How is this done? Colin decides to give one to Daren.
Any scene with Luke in it, special mention to his and Owen's confrontation with Calvin in the ruins.
The drink off between Duke and Karen in Friends of Mineral Town, especially the aftermath with Manna berating Duke. You have to get Karen at green heart for it, but it's totally worth it.
The infamous "macaroni scene" in A New Beginning.Klaus walks into the restaurant, and out of complete nowhere, begins on a lengthy tirade on why macaroni has a hole in it and how this reflects on humanity. Clemet becomes increasingly alarmed as Klaus just keeps. Going. On.Watch it in all its glory here.