Shell Earrings

The Shell Earrings is a jewelry that belongs to the waitress on the Excess Express in Paper Mario: The Thousand-Year Door. During the events of Chapter 6, while Mario and his team are aboard the Excess Express to Poshley Heights in search of the Garnet Star, the earrings are stolen by the Shadow Sirens. Beldam, Marilyn and Doopliss (disguised as Zip Toad) plan to use the earrings as a source of seashell calcium to create an explosive form of Nitro Honey Syrup to bomb the train to prevent Team Mario from obtaining the Star; the other two items they seek are the Nitro Honey Syrup plans from the Businessman's briefcase and a source of gold (Toodles' Gold Ring). Team Mario (with assistance from Pennington) is able to foil the evil trio's plan, and all three stolen items are returned to their rightful owners. When Mario returns the Shell Earrings to the waitress, she rewards him with a Star Piece in gratitude.

According to in-game descriptions and the waitress herself, her ex-boyfriend gave her the Shell Earrings, who apparently talked to her via telephone shortly after Mario returned her earrings. Mario may have actually met this ex-boyfriend, because talking to a certain unnamed Squeek (who often tells Mario of his many love relationships) after beating Chapter 6 reveals that he was once in love with the waitress. Squeek also wonders if the waitress still cherishes them as he spoke to Mario.