When I was a kid, "Gunsmoke" was my favorite. I loved how Festus would always butcher the English language.
My favorite part was probably when the snake oil salesman came to town. Festus tells the snake oil dealer "You can't go sellin' that around here until we're sure it's fit for public conniption."
Movies?
I really liked "The Outlaw Josey Wales" and "Two mules for Sister Sara". "Unforgiven" gets an honorable mention.
I also have to confess to enjoying "The Life and Times of Grizzly Adams". Can't imagine why.
Another little Festus tidbit, from IMDB:
Dr. Galen 'Doc' Adams: [Festus offers to buy Doc a beer with a silver dollar that he earned from shoeing horses in episode "Whelan's Men".] Why don't you take that money and invest it in something? Why don't you do that?
Festus Haggen: Invest it in what?
Dr. Galen 'Doc' Adams: There's wonderful land values outside of Dodge. Now why don't you go out there someplace, look around, and buy yourself a lot?
Festus Haggen: A lot of what?
Dr. Galen 'Doc' Adams: A lot! A lot of land!
Festus Haggen: Well fiddle, I can't afford to buy a lot of land. You probably could the way you've been a bilking and gouging...
Dr. Galen 'Doc' Adams: Oh, hush up! I'm trying to help you, for heaven sakes. It don't cost a whole lot to buy a little lot.
Festus Haggen: What do you mean it don't cost a whole lot to buy a little, or a whole lot to buy a lot, what do you mean?
Dr. Galen 'Doc' Adams: Well, I mean,... a little lot of land!
Festus Haggen: But there ain't no such a thing. A little's a little, and a lot's a lot, there ain't no little lot, or lot of little, don't you see? Now you want that beer or don't you?
Dr. Galen 'Doc' Adams: No I'm... I'm all worn out.
Festus Haggen: [and as Doc walks away Festus Hollers] If you change your mind me and Newly will be over at the Longbranch having a whole lot of little beers.
[Chuckles and flips his silver dollar]
Festus Haggen: Now I'm buying.