A couple of farmers are selling produce illegally on the side of the road just outside Mayberry. Barney, in his usual imperious way, tells them to move on, but the two men just make fun of him. Andy (as he often does) creates a ruse to bolster Barney's confidence and allow him to scare the farmers out of town. That's the first act. In the second act, the conflict is deepened and broadened, and Barney must finally face the bullies without the "crutch" that Andy often provides him.
This is one of my favorite episodes of THE ANDY GRIFFITH SHOW. It demonstrates several aspects of what made the series so great: of how it trod the delicate line between comedy and pathos, and between being a kids' show and an adults' show. Certainly, seeing Barney face off the two adult "bullies" is a heartening spectacle for younger viewers, while for adults the episode offers object lessons in different approaches to human relations (Barney's pomposity versus Andy's calm, friendly yet firm approach). Unlike some other episodes in which Andy bails Barney out of a tough spot, this one plays for poignancy rather than laughs, and we see Barney genuinely grow in stature as a person thanks to Andy's guidance. The episode also features beautiful photography of the country road and the produce truck, and a great cinematographic moment as Barney, swelling with pride at his policing skill, stands with his hands on his hips as Earle Hagen's mock-police music blares. After so much dramatic tension, the "epilogue" is a little weak; but that is a small flaw in an outstanding episode.