Samantha was most famous for that nose twitch. But how exactly did producers come up with that famous move? Credit should be given to the actress herself. According to biographer Herbie Pilato, the this quirk was inspired by real life. That’s because Montgomery would involuntarily make this movement whenever she was anxious or nervous. Hence, director William Asher, the man she was married to then, conveniently made it a part of the show. And the rest, they say, is TV history.