Carla: What the hell is keeping Diane? I'm gonna be late for school.
Frasier: School, Carla? Well, I must say I'm delightfully astonished. You know, I've always held that adult education is one of the finest gifts that one can give oneself. Kudos on joining the ever-burgeoning ranks of enlightened, wondering minds seeking betterment through knowledge.
Carla: It's traffic school, you nimrod.