There's nothing but love and tenderness between Pauline and her grandmother, like a hyphen joining youth and age. But recently, people have stopped laughing when Grandma says funny things. Pauline's parents say the doctors have detected a disease. That's why Grandma is mixing up her words and forgetting things, and also why this is no laughing matter. But Pauline knows the actual truth: her grandma really is telling jokes. It's just that her parents have no sense of humor!