Yoda: Why wish you become Jedi? Hmm? Hmm?
Luke: Mostly because of my father, I guess.
Yoda: Ah, father. Powerful Jedi was he. Hee hee. Mmm, powerful Jedi.
Luke: Oh, come on. How could you know my father? You don't even know who I am.

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As Yoda cooks he questions Luke about his intentions.

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