Life gives us so few moments of pure serendipity. So when they happen, I think it’s important to stop and appreciate the universe’s happy accidents. Like when Kristin Chenoweth called up a random audience member while performing at the Hollywood Bowl last Friday to sing with her on “For Good.” And that audience member turned out to be a vocal instructor who could really, really sing. That’s what happened when Sarah Horn came on stage. I love when, given that once-in-a-lifetime chance at something extraordinary, we humans totally nail it. And I love how much everyone’s favorite pocket-sized human, Cheno, loved the moment, too. Good on you, Sarah.