A power failure that plunged their venue into darkness on the opening night of the Fringe couldn’t stop Chris Ross and Travis Bernhardt: they performed outside their venue, lit by audience members’ phones.

The show, entirely improvised and performed in gibberish, exploits a very porous boundary between audience and performers; be prepared to play along. The performance I saw had occasional moments of comic genius, like a perfectly paced sketch in which two mourners try to retrieve their wedding rings from the body of a deceased friend, but other bits struggled to find shape.

That’s improv: you don’t always hit your groove, but you can have a lot of fun trying.