8. "The Wheel" (Season 1, Episode 13)
Don's finest moment as a salesman, pitching his idea for the Kodak Carousel — he gives a room full of strangers a tour through a life that isn't really his and a family he barely knows, getting sentimental over a childhood he never had. The man whose life goes in only one direction — forward — ponders what the word "nostalgia" means. Harry Crane isn't the only one who loses it at this speech. And just when you think you're all wrung out emotionally, it turns out there's one more scene left. Don't think twice, it's all right. Damn.
Best line: "This device isn't a spaceship. It's a time machine."—Don Draper