''Showdown,'' season 2, episode 20

Harris lived out a personal fantasy while exploring Barney's slightly cuckoo delusions about his birth father — namely, that he is the secret love child of Bob Barker. Barney's quest took the whole show to the Price Is Right set shortly before Barker's retirement, much to Harris' delight. ''I've watched The Price Is Right since I was a wee tot,'' Harris explains, ''and I always dreamt one day I would be on the show. But then suddenly I was an actor on TV [with Doogie Howser, M.D.], and you can't be on The Price Is Right if you're on TV. So we finally accomplished my goal.''