Best Throwaway Lines/Scenes
Little moment sin movies are my favorite. They are not central to the plot or visually stunning. They happen in a brief moment, sometimes by accident. They are all about making a characters in a movie deep and meaningful and real. And they happen in every movie, even mediocre ones.
Example of Throwaway Line
In Big Lebowski, The Dude is talking to Jackie Treehorn.
Jackie says:
"The brain is the biggest erogenous zone"
and The Dude says:
"On YOU maybe..."
Example of Throwaway Scene
The end of Good Will Hunting, Will no longer rides shotgun, so Casey Affleck leaves the backseat and gets to ride shotgun now.
Isn't The Big Lebowski nothing but throwaway lines?
Just throwing one out there, in that new Sherlock Holmes movie:
Watson: "Those days are behind me."
Holmes: "Right behind you."
That one kind of stuck with me.
Si vis pacem, para bellum
"Well, that's, like, your opinion, man."
Beetlejuice, at dinner when Otho is talking about being a paranormal researcher and that lady with the black hair goes:
"Paranormal - is that what they're calling your kind these days?"
And Otho replies : "Don't mind her. She's still upset, because somebody dropped a house on her sister."

My brand new 2011 halloween comp:
http://soundcloud.com/brosupremo/hallowmix-2-the-deadening/s-BKf8z
That's a great movie for throwaway lines.
To this day, I'll just blurt out "Ooooooooo! I got demons runnin' all though me!" at least once a month.
Donnie Darko
"They even found feces."
"What's that?"
"Baby mice."
"Aww."
Everyone knows baby mice are called "meeses."
That reminds me of this one from Donnie Darko:
"Good shit, huh?"
"It's a fucking cigarette."
I always chuckle at that.
Si vis pacem, para bellum
Good Will Hunting:
Will: "Fuck you"
Sean: "You're the shepherd"
or anything Steve Zahn says in Employee of the Month
Foot Fist Way is full of them.
"How many slices have you had Julio? How about you've had enough."
"-So Henry how's school going for you?
-It's been alright.
-Still planning on going to college?
-Yes sir.
-That's okay I guess. Julio of course is up to nothing."
To a pretty girl interested in Tae Kwon Do: "Meditation is terrific and all, but I've never heard of it saving anyone from a gang rape type situation. Meditate on that. Rape."
To fat guy not really interested in Tae Kwon Do: "If you were in prison, you'd be raped because you exude feminine qualities. You're also a big ole fat piece of ass."

My brand new 2011 halloween comp:
http://soundcloud.com/brosupremo/hallowmix-2-the-deadening/s-BKf8z
Wow those are great.
Rob Reiner's 80s movies had some great throwaway lines. There are lots in Stand by Me but I think that nearly every line in When Harry Met Sally is gold.
Harry: Had my dream again where I'm making love, and the Olympic judges are watching. I'd nailed the compulsories, so this is it, the finals. I got a 9.8 from the Canadians, a perfect 10 from the Americans, and my mother, disguised as an East German judge, gave me a 5.6. Must have been the dismount.
Harry: You know, I have a theory that hieroglyphics are just an ancient comic strip about a character named Sphinxy.
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 that they had food in Ethiopia? This will be a quick meal. I'll order two empty plates and we can leave." Yeah, nothing from her not even a smile.
Spinal Tap
[Asked to write his own epitaph]
David St. Hubbins: Here lies David St. Hubbins... and why not?
[Derek Smalls sets off a metal detector at the airport]
Airport Security Officer: Do you have any artificial plates or limbs?
Derek Smalls: Er, not really.
A Few Good Men
"I'm sorry, I keep forgetting you were sick the day they taught "law" at law school."
Si vis pacem, para bellum


Great topic. I'll come back when my mind isn't blank.