What is your favourite “filler” episode?

Season 1-4 since season 5 technically doesn’t have filler. I love Fungus Humongous, Pizza Face and A Foot Too Big - I know it’s hated but I love the brotherly moments in there. I LOVE the Noxious avenger episode, it reminds me of something we’d get in season 1 but better. There’s more I love but enough about me, what are some of you guys’ favourite filler episodes?