AFI #037 Arnold Schwarzenegger as The Terminator from The Terminator (1984)

The Terminator: I'm a friend of Sarah Connor. I was told she was here. Could I see her please?
Desk Sergeant: No, you can't see her. She's making a statement.
The Terminator: Where is she?
Desk Sergeant: It may take a while. Want to wait? There's a bench over there.
The Terminator: [looks around, examining the structural integrity of the room, then looks back at him] I'll be back.

- Arnold Schwarzenegger as The Terminator from The Terminator (1984)

The bolded line is ranked #37 in the American Film Institute's list of the top 100 movie quotations in American cinema.

The character returns by driving a car through the front door. Schwarzenegger has been quoted that he hadn't thought much about the line when filming the movie. James Cameron notes in the DVD features that he expected the line to only get a laugh upon repeat viewings when what the character means is known, and was surprised to see it get a big reaction from first-time audiences who had quickly come to understand the character and immediately anticipated the outrageous violence the nonchalant line signifies. In the novelization of the film script, titled The Terminator by Shaun Hutson the Terminator says "I'll come back," rather than "I'll be back," on page 117. ISBN 0-352-31645-4.

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http://en.wikipedia.org/wiki/I%27ll_be_back

AFI #049 Colin Clive as Henry Frankenstein from Frankenstein (1931)

Henry: Look! It's moving. It's sha — it's... it's alive. It's alive... It's alive, it's moving, it's alive! It's alive, it's alive, it's alive! It's ALIVE!
Victor: Henry — in the name of God!
Henry: Oh, in the name of God! Now I know what it feels like to BE God!

- Colin Clive (1900-1937) as Henry Frankenstein from Frankenstein (1931)

The bolded line is ranked #49 in the American Film Institute's list of the top 100 movie quotations in American cinema.

AFI #076 Arnold Schwarzenegger as The Terminator from Terminator 2: Judgment Day (1991)

Hasta la vista, baby became a world-famous catchphrase when it was used in the 1991 film Terminator 2, which was written by James Cameron and William Wisher Jr. The phrase features in an exchange between the film's characters John Connor (Edward Furlong) and the Terminator (Arnold Schwarzenegger):

John Connor: No, no, no, no. You gotta listen to the way people talk. You don't say "affirmative," or some shit like that. You say "no problemo." And if someone comes on to you with an attitude you say "eat me." And if you want to shine them on it's "hasta la vista, baby."
The Terminator: Hasta la vista, baby.
John Connor: Yeah but later, dickwad. And if someone gets upset you say, "chill out"! Or you can do combinations.
The Terminator: Chill out, dickwad.
John Connor: Great! See, you're getting it!
The Terminator: No problemo.

The Terminator says the phrase again prior to shattering the frozen T-1000 with a gunshot:

The Terminator: Hasta la vista, baby.

- Arnold Schwarzenegger as Terminator from Terminator 2: Judgment Day (1991)

The bolded line is ranked #76 in the American Film Institute's list of the top 100 movie quotations in American cinema.