Being funny isn’t easy. Figuring out what makes things funny is even harder. Still, a number of psychologists (e.g., Freud) and philosophers (e.g., Bergson) have tried. Now computer scientists are trying to learn enough about humor to construct programs that can write good jokes; maybe an artificial stand-up comedian is on the way. Ken and John discuss the art, philosophy and science of humor with Tony Veale, an Irish computer scientist who knows a good joke when his program produces one.