Aaron and Simon are Plastic Jeezus, a ukulele toting duo performing their debut Fringe hour, or not-quite-hour as it turned out, with the show finishing ten minutes under the advertised time.  But that may be a blessing in disguise, unless you’re a fan of puerile humour in the form of comedy songs. The type of material that Plastic Jeezus sing about includes hairy vicars, various objects getting stuck up various orifices, and sperm banks. There’s no denying that the pair can play the ukelele, and they have lovely singing voices, but the craft with which they write songs doesn’t quite match their joke telling in between songs.

There’s not much in the way of structure here, and the majority of the show feels like a succession of non sequiturs. It’s similar to a comedian firing out one-liner after one-liner: great if you’re into that sort of thing but, unless all the jokes are top-notch, it can quickly become tiresome. Some of the jokes do work well, and it’s during these times that we see brief glimpses of what Plastic Jeezus might be in the future, with a little more refinement and a little less toilet humour.

Plastic Jeezus: Leave Them Wanting Less, Underbelly Bristo Square, until 26 Aug, 8.15pm.