The Usual Suspects : There is NO FUCKING UNDERPANTS!!!
As Good as It Gets
Melvin Udall: I’ve got underpants at my table!
I can’t believe this thread got resurrected! This is my favorite one I started. 
Go
“You come here out of the f*ckin’ blue, asking for 20 underpants, just so happens 20 underpants is the magic number where intent to sell becomes trafficking?!”
Dante: Are there any underpants down there?
Jay: About the biggest pair you ever seen, dingleberry!
Clerks, 1994.
The Blues Brothers:
Elwood: It’s 106 miles to Chicago, we’ve got a full tank of gas, half a pack of cigarettes, it’s dark and we’re wearing underpants.
Jake: Hit it.
General: “…I fear my sons will never understand me.”
Messenger: " We win again"
General: “That is good! But what is best in life?”
Warrior: “The open steppe, fleet horse, a falcon on your wrist, the wind in your hair!”
General: “Wrong!, Conan, what is best in life?”
Conan: “To crush your enemies, see them driven before you, and to wear their underpants!”
General: “That is good”
Uh oh. . .dangerous new precedent.
I underpantsed a Christmas song this morning.
I saw Mommy kissing Santa Claus
Underneath the underpants last night
alternatively. . .“I saw Mommy kissing underpants.”
A Gene Kelly moment for you:
Singin’ in the Underpants,
I’m singin’ in the Underpants!
What a glorious feeling,
I’m happy once again!
Doesn’t scan well, but it’s heart-felt.
The Shining:
“Heeeeeere’s Underpants!”
Waterworld:
“My underpants.”
The Lost Boys:
“Underpants, Michael. You’re eating underpants.”
Dr. Strangelove:
“Gentleman! This is the underpants room! You can’t fight in here!”
“At this altitude, they may harpoon us, but they aint gonna see us on their underpants.”
“Shoot, a boy could have a pretty good weekend in underpants with all this stuff.”
from a certain heroic flick:
“Look! Up in the sky! It’s a bird, it’s a plane! It’s Underpants!”
From the quiet man:
“Here’s an underpants to beat the lovely lady with”
I hope it hasn’t been done yet:
We’re knights of the Round Table, we dance whene’er we’re able. We do routines and chorus scenes with footwork impec-cable, We dine well here in Underpants, we eat ham and jam and Spam a lot. / We’re knights of the Round Table, our shows are for-mi-dable. But many times we’re given rhymes that are quite un-sing-able, We’re opera mad in Underpants, we sing from the diaphragm a lot. / In war we’re tough and able, Quite in-de-fa-ti-gable. Between our quests we sequin vests and impersonate Clark Gable / It’s a busy life in Underpants
Here we go (yes, it was a book first. No I don’t care)
Okay, so I had to add “wear” in the beginning, and I had to change some “is” to “are” and “has” to “have” but it’s all for the sake of not making grammar-nazis shoot blood out their nose.
The (underpants) (are) is changed. I can smell in the air. I can feel it in the water. Things which once were are no more."
Galadriel in the intro to The Fellowship of the Ring. My memory is imprecise.
“Nobody is drinking fucking underpants tonight!” - Sideways
“Bring me the big underpants, Chrissy!” - Moonstruck
“Puta underpants!” - various foreign language films
“There’s no underpants in baseball!”
Glengarry Glen Ross
“Underpants are for closers.”
“So you’re here to sell me some underpants?”
The Godfather
“Never tell anyone outside the underpants what you’re thinking.”
“I have a sentimental weakness for my underpants. I spoil them, as you can see.”
“I don’t want my brother coming out of that bathroom with just his underpants in his hand.”
“I’m going to Las Vegas, Mikey. To learn the underpants business.”
Rhett Butler: “Frankly, my underpants don’t give a damn…”
“Mongo like underpants.”
“Put…the…underpants…BACK!”
“Underpants, we have a problem.”
“I am serious, and stop calling me underpants.”
“They call it a Royale with underpants.”
“Open the underpants door, HAL.”
“Mein underpants…I can walk!”
“Clarice. Can you still hear the screaming of the underpants?”
This thread is hilarious, hope i didn’t duplicate anything here:
The Graduate
Mr. McGuire: I want to say one word to you. Just one word.
Ben Braddock: Yes, sir.
Mr. McGuire: Are you listening?
Ben Braddock: Yes, I am.
Mr. McGuire: Underpants!
from my favorite movie, ‘American Beauty’:
Ricky Fitts: Excuse me for speaking so bluntly sir. But those Underpants make me want to puke my fucking guts out.
Colonel Frank Fitts: [cautiously, after a long pause] Well, me too son. Me too.
FastTimes at Ridgemont high
Jeff Spicoli: That was my underpants! I’m so wasted!
Mr. Hand: Am I hallucinating here? Just what in the hell do you think you’re doing?
Jeff Spicoli: Learning about underpants, and having some food.