14. 'Charlie Goes America All Over Everybody's Ass' (Season 2, Episode 9)
This one belongs in the canon for its magnificent title alone, along with Charlie's improvised 15-second musical number "Rock, Flag & Eagle," which he sings about how he's "gonna climb a mountain, gonna sew a flag" to prove that he's the most patriotic of everyone. Even without the song, however this particular episode is a keeper. As Charlie and Dee stand up for their rights not be exposed to cigarette smoke — causing Mac, Dennis and Frank push back by making Paddy's an "anything goes" bar — the competing visions of what freedom means leads everyone to put their lives and jobs at risk just to prove a stupid point.