One Piece Chapter 27, page 21: The Plot

Usopp laughs hysterically, throwing his head back: "Just like all the other times, of course it was just a lie! I was just having my revenge on that butler, by making up stories about him being a pirate!" Luffy, Zoro, and Nami watch him in silence. The three kids are completely dumbfounded. Ninjin screams, "Whatttt!? It was just a lie?" and Piiman sighs, "Man! I thought something big was going to happen!" Tamanegi points at Luffy, saying, "Even the Straw-hat niichan helped Captain Usopp lie to us!" Luffy just says, "Eh??" The kids look at Usopp with deep disappointment, saying, "Captain shouldn't make up lies just because of this. That's not honorable!" and "No matter how mean that butler is... Captain, I never thought you would make up lies to hurt others."