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Best: Trudy kicks Pete to the curb
Episode: "The Collaborators" (603)
Pete Campbell's reckless behavior finally got the best of him when he has a fling with a neighbor whose abusive husband finds out and beats her up, sending her right over to Pete and Trudy's doorstep. Trudy acknowledges she hasn't been blind to Pete's affairs, but he went too far by fooling around so close to him. In one of Alison Brie's best scenes ever, Trudy kicks Pete out of their home and sets the terms on which they'll keep up the appearance of a happy marriage.