They say there’s an advantage to knowing at an early age what you want to do with your life. For comedian Louis Katz that discovery was made at the age of nine when he submitted several jokes to the Tonight Show Starring Johnny Carson. The host read two of Katz’s gags on the air and thus began the journey. After graduating from the University of California at Berkley, he started doing stand-up in the San Francisco Bay area. Now based in New York, he has appeared on Comedy Central Presents, Live at Gotham, and HBO’s Down & Dirty with Jim Norton. In 2011 he released his debut CD If These Balls Could Talk. He also produced a series of short films for Adult Swim’s Superdeluxe.com, which can now also be seen on his YouTube channel.Tonight Show. “I have a big heart and small hands,” he tells an audience. “Bad for fighting, but good for fisting.” $4-$15, Thursday-Sunday.