The Andy Griffith Show (1960)

S3E13 The Bank Job

Barney grows increasingly convinced that the Mayberry bank is an easy target for thieves and decides to demonstrate his theory by orchestrating a mock robbery. While investigating the bank's security, he unintentionally reveals a vulnerability to a pair of genuine criminals lurking nearby. As his plan unfolds, Barney unwittingly puts the entire town at risk, leading to a chaotic situation that he must resolve before it spirals out of control.