Another battle of the paintbrush between the Pink Panther and a diminutive painter, who this time is Leonardo Da Vinci, painting his masterpiece, the Mona Lisa. The little Da Vinci paints a pouting mouth on the Mona Lisa, but the Pink Panther decides to covertly replace the pout with a smile. When the smile wins the appreciation of an art patron, Da Vinci is enraged and repaints the pout. The Pink Panther repeatedly changes the pout to a smile while the little painter is not looking, and ultimately it is the Pink Panther's version of the Mona Lisa that hangs in the Louvre.