Nobody on NPR seems to be having more fun than the cast of “Wait Wait… Don’t Tell Me!,” a weekly news quiz hosted by playwright and actor Peter Sagal in which listeners play by phone. Each week a panel of humorists and journalists—including regulars like Amy Dickinson, Paula Poundstone, P.J. O’Rourke and Mo Rocca—guide the contestants through the games between chuckles and inside jokes, struggling to contain their laughter. The grand prize for one lucky listener is a personalized voicemail greeting from the show’s official judge and scorekeeper, esteemed newscaster Carl Kasell.