Vacation:

Clark: I think you're all fucked in the head. We're ten hours from the fucking fun park and you want to bail out. Well I'll tell you something. This is no longer a vacation. It's a quest. It's a quest for fun. I'm gonna have fun and you're gonna have fun. We're all gonna have so much fucking fun we'll need plastic surgeory to remove our godamn smiles. You'll be whistling 'Zip-A-Dee Doo-Dah' out of you're assholes! I gotta be crazy! I'm on a pilgrimage to see a moose. Praise Marty Moose! Holy Shit!

In Cousin Normy's backyard in the pouring rain]
Ellen Griswold: We can't leave Aunt Edna on the patio!
Clark: Would you prefer I slip her in the night deposit box at the funeral home?

Clark Griswald: Aw, there's Buckingham Palace, kids, that's where the Queen lives and works.
Audrey Griswald: What does she do?
Clark Griswald: She queens. And she vacuums.

Princess Bride for a few:

Vizzini: INCONCEIVABLE!!

Inigo Montoya: Hello. My name is Inigo Montoya. You killed my father. Prepare to die.

Westley: Hear this now: I will always come for you.
Buttercup: But how can you be sure?
Westley: This is true love -- you think this happens every day?

Westley: I told you I would always come for you. Why didn't you wait for me?
Buttercup: Well... you were dead.
Westley: Death cannot stop true love. All it can do is delay it for a while.

Inigo Montoya: You seem a decent fellow. I hate to kill you.
Westley: You seem a decent fellow. I hate to die.

Vizzini: I can't compete with you physically, and you're no match for my brains.
Westley: You're that smart?
Vizzini: Let me put it this way. Have you ever heard of Plato, Aristotle, Socrates?
Westley: Yes.
Vizzini: Morons.

Buttercup: We'll never survive!
Westley: Nonsense! You're only saying that because no one ever has.

from Pulp Fiction:

[After a long pause in their conversation]
Mia: Don't you hate that?
Vincent: Hate what?
Mia: Uncomfortable silences.

from Chocolat:

Storyteller: Once upon a time there was a quiet little village in the French countryside - whose people believed in Tranquilité - Tranquility.

from Chocolat:

Roux: I'll be back later to get that squeak out of your door. :slurp:

Butch Cassidy and the Sundance Kid:

Butch: "I couldn't do that. Could you do that? Why can they do it? Who are those guys???

For anyone interested...I found a translation of the conversation in Latin from Tombstone that was posted earlier...

http://www.dacc.cc.il.us/~jeff/tombstone-latin.html