16. 'Mac Day' (Season 9, Episode 5)
Rob McElhenny plays Mac as a guy with boyish enthusiasm and an easily bruised ego, which is a big part of what's kept that character (and his pals) from seeming irredeemably, unwatchably awful. "Mac Day" is both a celebration and explanation of Sunny's karate-loving, Christian fundamentalist, repressed homosexual man-child. When the Paddy's crew has to spend the whole day doing whatever their bartender wants, they're initially annoyed. Then Mac's badass country cousin (played by Seann William Scott) rides into town, and we get a demonstration of how martial arts and incessant drunkenness can be cool when practiced by someone who's not trying so hard.