Office Space as mentioned above is epic; one must actually have to wrok in the office before they can truly understand it. I have yet to see THE OFFICE.
How about
Blazing Saddles "Excuse me while I whip this out!" or basically anything Gene Wilder did.
[quote author=RedTerePro link=board=movies;num=1092179869;start=0#11 date=08/11/04 at 16:56:43]1. Almost every scene in Clockwork Orange is hilarious.
2. The scene in Taxi Driver when Martin Scorsese asks Robert De Niro if he knows what a .44 Mag will do to a woman's P***Y. That was f**kin hysterical.[/quote]
Also in taxi driver when he walks up to the pimp and says "Suck on this!" and shoots him with the magnum
Any part in Bubba Ho-tep when Bruce Campbell talks about his sickly pecker.
Girl in skirt bends over.
Bruce: (VO) The revealing of her panties was not intentional or unintentional, she just didn't give a damn. She found me so physically and sexually non threatening, she didn't mind if I got a birds eye view of her love nest.
I felt my pecker flutter once like a pigeon having a heart attack. Then layed back down, limp and still. Cours' these days a flutter was reasurin'.
What? No mention of Stripes? The Bill Murray and the whole movie was a "funniest scene"!!
-"Hey you cant park that car there!"
"We're not parking the car, we're abandoning it."
-"Are any of you homosexuals?"
"you mean, like flaming"
"just a standard military question. . ."
"no, but we are willing to learn!"
"yeah, would they put some place. . .special?
-"So, where ya from, Tex?"
"Dont you ever touch me again, ever!"
-"Uncle Hulka?"
-"I'd like something lowrise, bikini--mesh if possible!"
-"Son, there ain't no draft no more."
"There was one?"
-"Lee Harvey--You are MADMAN!!!"
-Francis "Psycho's" whole intro speech(. . .and i'll kill you!)"
Theres a lot more I couldve written, but I couldnt stop laughing while typing in the quotes I off the top of my head ;D