Brecht was not a great comedian, but several of his friends were. Both Karl Valentin and Charlie Chaplin influenced the playwright, and led him to invent stage characters who could be described as political clowns. The first of these clowns, Galy Gay, appeared in 1926, as the humble Irish porter who becomes a 'human fighting machine' in Man is Man.

The play remains an important document of Brecht's political humour, as well as of his development of epic theatre and a Marxist aesthetic in the 1920s. It has also been regarded as a critique of militarism, imperialism and what Brecht later called 'the bad collective' which destroys individualism; but the comic aspects of the play deserve special attention, since they reveal Brecht's innovations in political clowning. As if to acknowledge his closeness to comedy, Brecht has characters in the play speak of scenes in Begbick's canteen as 'numbers' — that is, variety acts like those performed in music halls.