James Campbell is the guy that does stand-up comedy for kids, and has carved out a very nice niche for himself in entertaining the harshest critics on the planet. However, not content with that, this Fringe he’s going one step further by running two shows simultaneously, featuring the same cast who’ll run from room to room.

Sounds like a logistical and emotional nightmare and begs the question – why? He explains that it came after the success of last year’s Onomatopoeia Society. ‘One of the cast members became so good I thought they needed a spin-off show,’ says Campbell. ‘So we created The Spinistry of Moonerism. They’re in the same world so it seemed like a good idea.’ But the boy isn’t stupid, and has written a ‘Something’s Gone Wrong Song’ that all the players can perform to plug any awkward gaps.

The Society is dedicated to onomatopoeia, and finding a better way of describing things than boring old fwahflaffle (ridiculous) English. In a world where chomp-eek-parp means squirrel, anything could, and probably will, happen. Mr Campbell explains the best way to enjoy the shows: ‘First of all you don’t have to have seen parts one and two, that’s very important. You can see them either way round. If you’re a family of four, then two go and see one, two the other, talk about it over the evening and then swap the next day – that’s the perfect way to do it.’

Assembly @ George Street, 623 3030, 4–27 Aug, 3.40pm, £6–£7 (£5–£6). Previews 2 & 3 Aug, £5 (£4).