Arthème loves playing the clarinet. He plays it in the streets, in the park, in the streetcar (at least when he does not miss it!). When he unfortunately walks under a piano clumsy removers are hauling, the heavy instrument falls down on him and he swallows his clarinet. A lot of people try to extirpate the protruding instrument but they all fail. Three farriers finally succeed in making him return to his former self.
Charles Servaes as Polycarpe becomes an inspector of sort; he goes around measure the length of women's skirts in Paris to make sure they don't reveal tooo much leg for the moral Apaches of Montmartre.
