Jessica Paré, 'Zou Bisou Bisou' (Season 5, Episode 1)
Jessica Paré went from a relatively unknown actress to the show's next-big-thing thanks to Megan Draper's sultry, over-the-top performance of this quirky French ye-ye tune. But beyond the sex-kittenish aspect of it, her display — which comes during a surprise 40th-birthday party she arranged for Don, a setting that clearly makes him uncomfortable — also serves to underscore the deep difference between the couple. Megan is younger, cooler, and thinks that Don will appreciate the production being made over him; he's embarrassed by the party, the hullabaloo, and most of all, his wife flaunting her sex appeal in front of their coworkers. Clearly, this is a match that will last, er, forever-ish?