Showcase Episode: "A Day's Work"
Loads of women at the Sterling Cooper office excel at making so-over-this-bullshit faces, but few can match Shirley. Especially when she gets her bouquet of roses stolen by Peggy: "I'm getting her coffee and I'm taking my time." She gives notice to Roger with a hilariously sincere attempt at a compliment: "You're very amusing." That one stings, and make no mistake, it was meant to.