Pulling the old switcheroo with his material, Langston Kerman's professed topic of how to be a good person is really just an excuse to delve into how terrible people can be. Some of the offences are mild (like his girlfriend's expectations for Christmas cards) and some are literally criminal (like the exploits of his sex-offender roommate). Most of the material leans heavily into the puerile, with mentions of defecation and Kerman's penis featuring prominently within his assessments of marriage, sexual politics, and his life as a schoolteacher. A section on the racial aspects of having a baby is a highlight, relying on acute social observations rather than gross bodily functions.

Edinburgh audiences are notoriously melanin-deprived and so some of his references are likely to suffer. For example, the mention of the name 'Jerome' elicits specific connotations for a British audience – namely Jerome Flynn, the actor known for Game of Thrones and duets with Robson Green – and not the associations that Kerman's joke depends upon.

This is his Fringe debut and he makes a positive first impression. Langston Kerman may have tried to present himself as an edgy, filth-spewing provocateur but he still manages to seem like a really good guy.

Underbelly Bristo Square, until 25 Aug (not 12), 7.45pm, £10–£11 (£9–£10).