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The Bob Newhart Show ended its six-season, 142-episode run with the aptly titled "Happy Trails to You." The show opens as Bob assumes his new responsibilities as a psychology professor in a small Oregon college. In flashback, Bob recalls how he bade farewell to his friends, colleagues, and patients back in Chicago. Best scene: The impromptu rendition of "Oklahoma." Bob Newhart's real-life father-in-law, character actor Bill Quinn, appears as Dr. Wyler. Written by Glen Charles, Les Charles, and Lloyd Garver, "Happy Trails to You" originally aired on April 1, 1978.