Granville encourages Gastric to express his artistic side in a local art competition, but he throws himself into self-expression more enthusiastically than anyone could have predicted. Granville buys a large collection of mystery tins. Unfortunat... (more)ely, Leroy and Granville are still none the wiser on the contents after they've opened one. Now they face the ultimate challenge - how can you sell something when you have absolutely no idea what it is?