Charles B. Pierce with Eastwood, who liked the story and helped Pierce develop it into "Sudden Impact" (1983), the fourth entry in Eastwood's Dirty Harry film series. Pierce was given a writer's credit for the story along with Joseph C. Stinson. Pierce is said to have written the phrase, "Go ahead, make my day," the film's most famous line, which went on to be identified as one of the ten best movie quotes of all-time by the American Film Institute. The phrase was inspired by something his father once told Pierce in his youth while encouraging his son to mow the lawn: "When
Go ahead, make my day robbery in progress. He kills all but one of the robbers in a shootout. However, the surviving robber grabs the fleeing waitress Loretta (Mara Corday), holds his gun to her head, and threatens to shoot. Instead of backing off, Harry points his .44 Magnum revolver into the man's face and dares him to shoot, saying with clenched teeth and in his characteristic rough grumble, ""Go ahead, make my day,"" meaning that if the robber attempts to harm Loretta in any way, Harry would be happy to dispatch the robber. At the end of the film, Harry, again, says ""Come on,