Now playing at UCB Theatre, *The World’s Most Interesting Sisters* is a comedy musical staged as a live New York event. It follows two sisters with competing origin stories, using songs and rapid scene shifts to test how identity gets performed for an audience. The show fits UCB’s downtown tradition of treating pop narrative as raw material for satire and character work. Its sharpest move is refusing to settle the sisters into a single “true” version, letting the contradictions carry the joke and the point.