Harry Stachini pulled the pin on a grenade a few years ago, by which he means he ended an eight-year relationship when he realised he wanted to get married… just probably not to her. This show is all about the fall-out from that grenade. Stachini is a confident performer with a well-structured hour that follows the tried-and-tested Fringe template from crowd work to autobiographical material to neat conclusion that’s lightly moralising.

While the ‘comedian does a show about a breakup’ premise might be standard fare, the tangents taken to get there are unpredictable. Along the way, there are musings on every topic imaginable: as long as it’s slightly edgy. Stachini covers everything from his experiences teaching an aspiring serial killer in his former job to a reimagining of the Virgin Mary’s life had she had an abortion. No boundary is left unpushed, but it’s not always done successfully. Some of his more controversial material receives a polite titter rather than a big belly laugh. It’d be worth reconsidering which of those honesty grenades are really worth pulling the pin on, but despite the occasional misfire, Stachini manages to keep the audience on side throughout for an engaging hour.

Harry Stachini: Grenade, Underbelly Bristo Square, until 26 August, 5.45pm; main picture: Lewis Coleman.