In season three of Mad Men, Sterling Cooper’s rainmakers — including Don Draper and Roger Sterling — are planning to leave the ad agency and to take as many clients as possible with them. They’re in the firm’s Manhattan offices on a Sunday morning, plotting their exit, when the knowledge dawns: they don’t know where the client files are. They stare at each other, aghast. Fans everywhere screamed, “Joan! Get Joan!!” And indeed, the hyper-competent office manager, Joan Holloway, joins the men in the next scene, finds the files, and later recreates Sterling Cooper’s smooth-running routines in a new agency.