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Jack Nicholson is pitch-perfect as the obsessive-compulsive curmudgeon Melvin Udall, who possesses some of the strangest and most curious tendencies ever concocted by screenwriters; his Udall is so human, so heartfelt, so genuine, and so whimsical and Nicholson perfects him to such a degree that not a moment of his screen time is unwanted or uninteresting: in my valid opinion, this is Nicholson's best performance of his career, and one of the most reverent performances in film history.