AFI #002 Marlon Brando as Don Vito Corleone from The Godfather (1972)

Johnny Fontane: A month ago, he bought the movie rights to this book. A best seller – and the main character, it's a guy just like me. I, uh, I wouldn't even have to act, just be myself. [choking up] Oh, Godfather, I don't know what to do. I don't know what to do.
[Don Corleone stands up and shakes Johnny]
Don Corleone: [shouting] You can act like a man!
[Don Corleone slaps Johnny]
Don Corleone: What's the matter with you? Is this how you turned out? A Hollywood finocchio that cries like a woman? [mockingly] "What can I do? What can I do?" What is that nonsense? Ridiculous. You spend time with your family?
Johnny Fontane: Sure I do.
Don Corleone: Good. A man who doesn't spend time with his family can never be a real man. Come here … you look terrible. I want you to eat. I want you to rest a while. And in a month from now, this Hollywood bigshot's gonna give you what you want.
Johnny Fontane: It's too late, they start shooting in a week.

Don Corleone: I'm going to make him an offer he can't refuse. Now, you just go outside and enjoy yourself, and, uh, forget about all this nonsense. I want you – I want you to leave it all to me.

- Marlon Brando as Vito Corleone from The Godfather (1972)

The bolded line is ranked #2 in the American Film Institute's list of the top 100 movie quotations in American cinema.

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American Film Institute's list of the top 100 movie quotations

AFI #003 Marlon Brando as Terry Malloy from On the Waterfront (1954)

Charlie: Look, kid, I - how much you weigh, son? When you weighed one hundred and sixty-eight pounds you were beautiful. You coulda been another Billy Conn, and that skunk we got you for a manager, he brought you along too fast.
Terry: It wasn't him, Charley, it was you. Remember that night in the Garden you came down to my dressing room and you said, "Kid, this ain't your night. We're going for the price on Wilson." You remember that? "This ain't your night"! My night! I coulda taken Wilson apart! So what happens? He gets the title shot outdoors on the ballpark and what do I get? A one-way ticket to Palooka-ville! You was my brother, Charley, you shoulda looked out for me a little bit. You shoulda taken care of me just a little bit so I wouldn't have to take them dives for the short-end money.
Charlie: Oh I had some bets down for you. You saw some money.

Terry: You don't understand! I coulda had class. I coulda been a contender. I could've been somebody, instead of a bum, which is what I am. Let's face it. It was you, Charley.

- Marlon Brando as Terry Malloy from On the Waterfront (1954)

The bolded line is ranked #3 in the American Film Institute's list of the top 100 movie quotations in American cinema.

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American Film Institute's list of the top 100 movie quotations

AFI #045 Marlon Brando as Stanley Kowalski from A Streetcar Named Desire (1951)

Stella! Hey, Stella!

- Marlon Brando as Stanley Kowalski from A Streetcar Named Desire (1951)

The bolded line is ranked #45 in the American Film Institute's list of the top 100 movie quotations in American cinema.