Pat Colby

A stranger comes to Mayberry and disrupts the life of the townspeople because he knows everyone's name and business.

Andy uses common sense and Barney uses "modern criminal detection methods" to solve several burglaries at a filling station.

Lucy and Vivian's sons boy scout club make a replica of the white house out of sugar cubes. The president is so impressed that he invites all of them to the white house to unveil it. Calamity ensues when the replica get destroyed on the train.