Join OTH and some of Perth’s funniest guest performers at Perth’s only weekly night of long-form improvised comedy and sketch. Join OTH and some of Perth’s funniest guest performers at Perth’s only weekly night of long-form improvised comedy. Every Thursday night at The Hidden Bar, performers take to the stage to create one packed hour of hilarious, fast-paced comedy all made up on the spot – inspired only by a yelled audience suggestion. With veterans and exciting new performers, comedians, monologists, live music, food and drink, The Comedy Underground is a regular Thursday night fixture in the heart of Northbridge.