If ever a director’s decision to cast an actor based solely on looks could be excused, it would be Pier Paolo Pasolini’s choice of Terence Stamp for the lead in 1968’s Theorem. As the mysterious, nameless, selfless houseguest of a well-off Milan family, Stamp (above) combines the insouciance of Malcolm McDowell in A Clockwork Orange with a passive saintliness appropriate to Pasolini’s satirical intent.