29. "New Amsterdam" (Season 1, Episode 4)
"Listen, Pete, I need you to go get a cardboard box. Put your things in it. Okay?" With these gentle words, Don finally gives that weasel Pete Campbell the axe, which feels long-awaited even though this is just the fourth episode of the series. Salty old patriarch Bert Cooper gives Don a lesson in how power operates: "Some people have no confidence in this country." It's Mad Men's first great Scary Bert scene, and definitely not the last.
Best line: "Your whole generation, you drink for the wrong reasons. My generation, we drink because it's good, because it feels better than unbuttoning your collar, because we deserve it. We drink because it's what men do."—Roger Sterling