A Jedi's Fury (Return of the Jedi)

Vader: [searching for Luke in Palpatine's chamber] You cannot hide forever, Luke. Luke: I will not fight you. Vader: Give yourself to the dark side. It is the only way you can save your friends. Yes, your thoughts betray you. Your feelings for them are strong. Especially for... [pauses] Sister! So, you have a twin sister. Your feelings have now betrayed her too. Obi-Wan was wise to hide her from me. Now his failure is complete. If you will not turn to the dark side, then perhaps she will! Luke: [revealing himself] NEVER! [Luke attacks Vader ferociously, eventually backing him onto a railing and cutting off his arm. He stands over Vader for a moment.] Palpatine: [laughing] Good! Your hate has made you powerful. Now, fulfill your destiny and take your father's place at my side! Luke: [Notices Vader's detached hand is bionic, like his own, has a realization, then turns to face the Emperor, throwing away his lightsaber] Never. I'll never turn to the Dark Side. You have failed, Your Highness. I am a Jedi, like my father before me. Palpatine: [angrily] So be it... Jedi!