Love, Billy Crystal as Harry Burns from When Harry Met Sally (1989)

Harry: Well, how does it work?
Sally: I don't know, but not this way.
Harry: How about this way? I love that you get cold when it's 71 degrees out. I love that it takes you an hour and a half to order a sandwich. I love that you get a little crinkle above your nose when you're looking at me like I'm nuts. I love that after I spend the day with you, I can still smell your perfume on my clothes. And I love that you are the last person I want to talk to before I go to sleep at night. And it's not because I'm lonely, and it's not because it's New Year's Eve. I came here tonight because when you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible.
Sally: You see? That is just like you, Harry. You say things like that, and you make it impossible for me to hate you, and I hate you, Harry. I really hate you. I hate you.
[They kiss]

- Billy Crystal as Harry Burns from When Harry Met Sally (1989)

http://en.wikiquote.org/wiki/When_Harry_Met_Sally

AFI #033 Estelle Reiner as Customer from When Harry Met Sally (1989)

Harry: You don't think that I could tell the difference?
Sally: No.
Harry: Get outta here.

[Sally begins to fake an orgasm]
Harry: Are you OK?

[Sally continues very audibly, attracting the attention of nearly every customer in the cafe. Afterwards, she returns to eating her dessert]

Older Woman Customer: [to waiter] I'll have what she's having.

- Estelle Reiner as a Customer from When Harry Met Sally (1989)

The bolded line is ranked #33 in the American Film Institute's list of the top 100 movie quotations in American cinema.