War of the Worms / I Owe You One

S12 E8: Brain is always taking the fun out of Fern's storytelling by correcting her facts. She decides to teach him a lesson by spinning a tall tale that he can't help but believe. But things gets out of hand, when Fern convinces Brain that there really are giant worms attacking Elwood City! / Buster's always asking Arthur for favors. One day he worries at the thought of having to repay them all at once, so Buster goes on a favor-repaying frenzy, helping everyone whom Arthur owes a favor to in hopes of getting himself out of this favor debt. But is Buster forgetting the real meaning of friendship?