One Piece Chapter 9, page 18: Chapter 9: Femme Fatale

Luffy eagerly asks Nami, "Really!? Yeah! And you could be our navigator!! Will you join my pirate crew!" Nami's cheerful expression instantly vanishes, replaced by a look of pure rage and disgust. She screams, "!! NO WAY!!!" Luffy is completely bewildered, staring at her with a blank, confused expression. Nami turns away, crossing her arms, and huffs, "Hmph... I didn't know that you were a pirate! Forget everything I said! I'd never team up with you!"