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Figuring that she's luckier than Sally (Rose Marie) because she is married with a son, Laura (Mary Tyler Moore) decides to play matchmaker by fixing Sally up with her cousin. Rob (Dick Van Dyke) warns Laura that this is a mistake, since Sally has a nervous habit of wisecracking incessantly whenever she meets a new fellow, especially a shy one -- and since the cousin's name is Thomas Edson, the poor guy hasn't got a chance. True to form, Sally is a laugh a minute during her dinner date with Thomas, never letting him get a word in edgewise. When it's all over, a contrite and tearful Sally figures that she's ruined another chance at romance -- but is she wrong!