Coco de Mer’s original ‘Teach Me a Lesson Ruler,’ is where you’ll find all your cheap spanking thrills. Serving suggestion: Coco de Mer’s wooden ruler is not only cheap but also very effective. Unlike other implements of pleasure it’s a sure bet for taking someone’s breath away with its sharp sting. Many keep this little spanking secret close to hand in their office desk drawer, because it is just so efficient.