If you're familiar with the 1960s and 1970s seminal research into social psychology, obedience, and conformity by Milgram and Zimbardo, you might be interested in The Human Zoo. Originally broadcast in May 2000, this three part series examines the psychology of 'brief encounters', 'following the herd' and 'crimes of obedience'. The programme features Zimbardo alongside other social psychologists discussing first impressions, deception, conformity, group dynamics and more.
It's essentially a slightly more serious version of Richard Wiseman's BBC2 series The People Watchers.
Thanks to Tamas Borbely for the recommendation.