One of my all time favorite movies ... Torch Song Trilogy.
Harvey Fierstein after he finds out that his son has revealed to his mother his relationship with Ed, and Ed responds with "Whoops."


"Whoops" Ed? Did you say "whoops?" No, Ed. "Whoops" is when you fall down an elevator shaft. "Whoops" is when you skinny-dip in a school of piranha. "Whoops" is when you accidentally douche with Drano! No, Ed. This was no "whoops". This was an AHHHHHHHHHHHHHHHHHHHHHh!!!!"

American Beauty
 

The plastic bag scene will forever be one of my favorites.

Harry: Well how does it work?

Sally: I don't know but not this way.

Harry: Well, how about this way? I love that you get cold when it's seventy one 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 you nose when you're looking at me like I'm nuts, I love that after I spend a 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 Years 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 the life to start as soon as possible.

Sally: (crying) 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.

(He grins at her, and through her tears, she smiles back)
(They kiss)

When Harry Met Sally
 

This is the "jealous dancing" scene I meant!