Building on the work of Del Close and his notion that improvisation, especially the Harold, can be more than a simple performance structure, the fluidity and organic approach to longform improv comedy espoused by the Impatient Theatre Co. creates improv shows that are sophisticated, layered and outright hilarious.

Since 2001, the Impatient Theatre Co. has been performing and teaching the Harold in Toronto. Harold Night is a showcase of the ITC's approach to longform improvisation, which has been said to be closer to the work done at the i.O. Theater in Chicago, than anywhere else in North America.