it's a toss up for me...but all are from gone with the wind (duh! as if you guys wouldn't have ever guessed that!)
Frankly my dear, I don't give a damn! (Rhett to Scarlett)
and
I won't think about that now, I'll think about that tomorrow (Scarlett said several times in the movie)
and
Open your eyes and look at me. No, I don't think I will kiss you. Although you need kissing badly. That's what's wrong with you. You should be kissed, and often, and by someone who knows how. (Rhett to Scarlett after he's given her a new bonnet)
and
Good Heaven's woman, this is war, not a garden party. (Dr. Meade to Aunt Pitty Pat when she comments that it's not right for a woman to stay without a chaperone)
i know...the one is a bit long, but i love that one!!