I am not a big fan of the color episodes, but this one is one of the best of the non-b/w ones. The story moves right along with Warren as the main regular cast character. This one could have been easily done with Barney and Gomer instead of Warren and Goober. The state sends its mobile museum trailer to Mayberry to celebrate Founder's Day and Warren is in charge of security. The problem is that Warren is obsessed with trying to fire the old cannon in the town square. Two crooks bamboozle him out of the keys and steal the priceless artifacts. Naturally, Warren bungles his way into stopping them. This episode is also noteworthy for the appearance of the great character actors Vaughn Taylor and Byron Foulger as Mayberry citizens. Sally Mansfield really brightens things up as one of the crooks. She is best remembered as spaceship navigator Vena Ray on the Rocky Jones, Space Ranger Show in the early 1950s. "The Cannon" is definitely a color epsiode worth watching.