The Wonder Bread by WanderingLola.deviantart.com on @DeviantArt | "Nico started to crawl away, groaning. Percy wanted him to move faster and to groan less. He considered throwing his Wonder bread at him." -The Mark of Athena, page 513-514.
This part is even more amazing because Nico has met so many demigods in the underworld, the ones that all of the legends are about and if he thinks that Percy is still the most powerful demigod he has ever met then Percy must be really incredible!