I've never seen 'A Lion in Winter' but these quotes from Katherine Hepburn really sell the film to me.
Henry II: The day those stout hearts band together is the day that pigs get wings.
Eleanor: There’ll be pork in the treetops come morning.
Eleanor: I could peel you like a pear and God himself would call it justice!
Prince John: A knife! He’s got a knife!
Eleanor: Of course he has a knife, he always has a knife, we all have knives! It’s 1183 and we’re barbarians!
There are other excellent examples in the comments on Ampersand's blog. For instance:
Margo Gunderson: And I guess that's your accomplice in the wood chipper (Fargo)
Uhuru (The alternative-universe one, holding a knife to Sulu's throat): You're away from your post, mister (best Uhuru quote ever)
Lina Lamont (Singin' in the rain): Why, I make more money than - than - than - Calvin Coolidge! Put together!
Ripley: I say we just take off and nuke the site from orbit.
Burke: Uh, hold on a second. This installation has a substantial dollar value attached to it.
Ripley: They can BILL me.
Mira Sorvino (in Remy and Michelle, declining a dance): “Excuse me; I cut my foot just now and my shoe is filling up with blood.”
Wendy, South Park movie:: Oh, Stan. I don’t love Gregory any more. Fuck him. Fuck him right in the ear!
Maudie (Charlene Holt), as Cole Thornton (John Wayne) and sheriff J.P. Harrah (Robert Mitchum) seem to be about to get in a fight over her: Don’t you think I’m woman enough for both of you?
Annie Wilkes: MISERY IS ALIVE, MISERY IS ALIVE! OH, This whole house is going to be full of romance, OOOH, I AM GOING TO PUT ON MY LIBERACE RECORDS!