John Wayne being John Wayne, Jimmy Stewart being Jimmy Stewart, both themselves and more than twice as natural. The Man Who Shot Lee Marvin, aka Liberty Valance.
The lines get a little confused in my mind but this is how I hallucinate them.
You look mighty pretty when you get mad..*.
Liberty Valance is the toughest man south of the picket wire.... [drum roll, fanfare, flashes of lightning, theme from Tom and Jerry, wait for it...] ... NEXT TO ME.
(Snarls smugly and leaves.)**
* Don't try this at home.
**Alternatively: Eats, shoots, and leaves.
That's it. There's no getting up from that. Out for the count.