Arthur, IMO, is a classic film. Hilarious. So many great lines, useful in everyday situations.
The one that seems to come up for me most at work is Hobbes asking Arthur:
“Would you like me to wash your dick for you, you little shit?”
In memory of Dudley Moore, please post your fave.
Just before that one, actually:
“Where’s the rest of this moose?”
“If you and your undershirt would step back two places, I could enter this dwelling.”
“Steal something casual.”
“It doesn’t suck.”
sniff 
I mean “paces”
“Don’t you HATE Perry’s wife??!!”
“He’s…taking the knife…out of the cheese…!!!”
“It’s a goner”
Susan: “Arthur, take my hand” Arthur: “That would leave you with one!”
“Bring me two aspirin–you’ll find them at the back of the medicine cabinet next to the untouched shaving cream”
“Arthur, you’re a good son” (That one makes me cry!!)
“You purchased a choo-choo!!” aww… bawl…!!!
Not all of us drink because we’re artists. Some of us drink because we’re not.
Not sure this is exact, but: “A pleasure to meet you, (Gloria?). One must usually go to a bowling alley to meet a woman of your stature.”
Sir Rhosis
Arthur: I’ll take seven of these sweaters, all green.
Clerk: All green?
Arthur: I don’t wear sweaters.
while at dinner with the prostitute:
Arthur: YOU’RE A HOOKER?!?! God, I thought I was doing so well with you.
(or something to that effect)
Arthur: I race cars, play tennis, and fondle women, BUT I have weekends off, and I’m my own boss.
(I just realized this applied to me in HS and college, but with the exception of some weekends off and occasionally fondling Mrs H8_2_W8, it no longer does).
Bert Johnson: “I never drink Arthur. It affects my decision making.”
Arthur: “You may be right. I can’t decide.”
This is my favorite one, too. But the actual quote is, “Not all of us drink because we’re poets. Some of us drink because we’re not poets.”
One of my other beloved quotes is,
“Where the hell’s my hat??”
A friend of mine and I got stuck on this line and said it at every opportunity for years. Said friend and I have also seen this movie at least four hundred times and we have yet to get tired of it.
I am really going to miss Dudley.
Thank you all!
Arthur is one of my all time favorite movies; I’ve seen it well over a dozen times, although not in the last couple of years. I used to be able to recite the movie along with the cast, yet I was coming up with a complete blank here.
The only quote that’s still stuck in my mind, though nowhere near as good as some of these, is:
“I wish I had a nickel for every nickel I have.” 
Of course, “It doesn’t suck” has been so much a part of my vocabulary for so long I’d totally forgotten where I’d heard it in the first place.
You’ll be missed, Dudley!
Mike
When Arthur’s father tells him that, if he doesn’t marry Susan, he’ll be cut off financially, and Arthur is trying to convince himself that Susan’s not all that bad: “Susan’s quite beautiful when the light hits her in a certain way- of course, you can’t depend on that light.”
My favorite: “Pardon me…oh, you’re a hedge!”
I also like the whole spiel about the very small country at dinner–
“Rhode Island could kick its ass in a war!”
“They recently had the whole country carpeted”
And I can’t remember exactly what he says, but something about it costing only a dollar to go from one end of the country to the other in a taxi.
Hee hee…
“He’s taking the knife out of the cheese…do you think he wants some cheese?”