Despite a long and prolific acting career that spans over 60 films, Clint Eastwood rarely worked with directors more than once. Only Sergio Leone, Don Siegel, and Ted Post worked with the actor on multiple occasions, with Post earning extra credit for directing "Magnum Force," a sequel to Siegel's "Dirty Harry." The directors in question might also be credited for creating some of Eastwood's most recognizable characters. Siegel and his screenwriters invented Harry Callahan, a tough-as-nails...