Broadway vet Jason Alexander assumes the role of Norman Drexel in Fish in the Dark on June 9, but before that, he stopped by The Tonight Show with his predecessor and the show’s creator: Larry David. Of course, Alexander created the role of George Costanza on Seinfeld—a part inspired by the series' co-creator David. The two discussed with Jimmy Fallon the ups and downs of rehearsing and starring in a show eight times a week, advice that Alexander gave to stage newcomer David and having certain nightly talk show hosts visit them backstage. Check out the clips below, then catch Fish in the Dark, now starring Alexander and Glenne Headly, at the Cort Theatre.