I have a young friend who had never seen 'When Harry Met Sally," arguably the funniest movie ever.  It's witty, sweet, charming and philosophical all at once.  We found that this movie stands up over time; it's just as funny in 2008 as it was when I first saw it in 1989.  So, here are some of my favorite lines:

Harry:  So how come you broke up with Sheldon?
Sally:  How do you know we broke up?
Harry:  Because if you didn't break up, you wouldn't be here with me; you'd be off with Sheldon the wonder schlong.
Sally:  First of all, I am not with you.  And second of all, it is none of your business why we broke up. 
Harry:  You're right, you're right.  I don't wanna know.
Sally:  Well, if you must know it was because he was very jealous and I had these days of the week underpants.
Harry:  <Fake buzzer sound> I'm sorry, I need a judge's ruling on this--days of the week underpants?
Sally:  Yes.  They had the days of the week on them and I thought they were sorta funny.  And then one day Sheldon says to me, "You never wear Sunday."  It was all suspicious:  Where was Sunday?  Where'd I left Sunday?  And I told him and he didn't believe me.  
Harry:  What?
Sally:  They don't make Sunday.
Harry:  Why not?
Sally:  Because of God.

Jess:  Marriages don't break up on account of infidelity.  It's just a symptom that something else is wrong.
Harry:  Oh, really?  Well, that "symptom" is fucking my wife.

Sally:  At least I got the apartment.
Harry:   That's what everyone says.  But really, what's so hard about finding an apartment?  What you do is look in the obituary section.  You see who died, find out where they lived, and tip the doorman.  What they could do to make it easier is combine the two.  You know, "Mr. Kline died yesterday, leaving behind a wife, two children, and a spacious three bedroom apartment with a wood-burning stove."

Harry:  We're talking dream date compared to my horror.  It started out fine.  She's a very nice person and we're sitting and we're talking at this Ethiopian restaurant that she wanted to go to.  And I was making jokes, you know like, "Hey, I didn't know they had food in Ethiopia.  This'll be a quick meal.  I'll order two empty plates and we can leave."  
Harry:  Yeah, nothing from her.  Not even a smile.

Sally:  ...All this time I've been saying that he didn't want to get married.  But the truth is, he didn't want to marry me.  He didn't love me.
Harry:  If you could take him back right now, would you?
Sally:  No, but why didn't he want to marry me?  What's wrong with me?
Harry:  Nothing.
Sally:  I'm difficult.
Harry:  You're challenging.
Sally:  I'm too structured; I'm completely closed off.
Harry:  But in a good way.
Sally:  No, no, no, I drove him away.  And I'm going to be forty!
Harry:  When?
Sally:  <crying> Someday!
Harry:  In eight years. 

So, what are your favorite lines from number 33 on the AFI's list of the best films of all time?