The Andy Griffith Show S03 E07 Lawman Barney

"Nip it in the bud!"

Barney loses his self-confidence when two unlawful bullies laugh off his attempt to run them out of town. Andy tells them Barney is actually a trigger-happy lawman out for vengeance, but the bullies quickly see through the ruse and Barney now must find the courage within himself to stand up to them.