Barney shows off the courthouse jail's maximum security cell to Opie's friends with an oft-repeated ending.



https://www.youtube.com/watch?v=vQcNEGrjn1M&list=RDYtsvsLFYYSg

In this short clip, Barney provides the rules of the Mayberry jail that he calls "The Rock"

https://www.youtube.com/watch?v=YtsvsLFYYSg&list=RDYtsvsLFYYSg