Barney kept order in Mayberry by operating by the book to the amusement and sometimes consternation of the citizenry. One of his favorite lines was that you have to "nip it in the bud." A compilation of these scenes is provided below.
https://www.youtube.com/watch?v=de_P2aUZJyA
The Mayberry townspeople and sometimes Andy loved to have fun with old Barney, particularly when he got a little full of himself.
https://www.youtube.com/watch?v=541RwJSUhNc