20. "Indian Summer" (Season 1, Episode 11)
Peggy does research on the vibrating Relaxiciser belt, which teaches her a thing or two about feminine rejuvenation. Joan puts make-up on a sickly Roger, who gives her not quite the romantic speech of her dreams: "I'm so glad I got to roam those hillsides." And Don stars in the most insanely erotic five-second drinking scene in Mad Men history, knocking back a casual slug of Canadian Club right before his fateful one-on-one meeting with Bert. All his pheromones are popping when he strikes a pose to utter the words: "I accept."
Best line: "Peggy, the conversation of a raise is not inappropriate at this moment. But do not be timid. You presented like a man, now act like one."—Don Draper