"It's Always Sunny In Philadelphia" co-creator and star Rob McElhenney talks with Chance Solem-Pfeifer about 14 seasons of changing yet not changing Mac, answering constant questions about his physique, and the new quarantine episode of his Apple TV+ comedy "Mythic Quest: Raven's Banquet." Plus, there's George RR Martin talk and McElhenney's overall advice for staying sharp and responsible as an artist.