What Is Your Favorite Movie Scene Of All Time??

Several are coming to mind (most of these are lines rather than scenes):

Comedies:
Dr. Strangelove: Peter Sellars stands up out of the wheelchair and says, "Mein fuhrer...I can walk!" BOOM...cue song: "We'll meet again...don't know where, don't know when..."

Eating Raoul: "Yes, it's amazing what she can do with a cheap cut of meat."

From the Guest/Levy/Shearer/etc. crew:
A Mighty Wind: When they show the "solo records" of Mitch. I literally fell out of my chair laughing.
Waiting for Guffman: "Nothing ever happens on Mars."
Best In Show: "And to think that in some countries, they eat these animals."

Buckaroo Bonzai: "Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are."

Coen Bros. movies:
O Brother, Where Art Thou? (too many to mention really): "Do not seek the treasure!"
"We thought you was a horny-toad."
"?...Do not seek the treasure!"
Raising Arizona: "Turn to the right!"
"Yer a flower, you are."
The Big Lebowski: "What the **** are you talking about, Walter? What does Viet Nam have to do with anything?"

Dramatic movies:

Bridge Over the River Kwai:
The final scene, as the camera follows the Eagle. "Madness...madness."

Lawrence of Arabia (greatest film ever made):
Lawrnece: "May we claim to ride in your name, sire?"
Feisal: "Yes, you may claim it,but...in whose name do you ride?"
another one:
Feisel: "Yes, but 'Aurence is a two-edged sword. I am sure we are equally glad to be rid of him."
Allenby: "My G-d...I thought I was a hard man, sir."
Feisel: "You are merely a general, while I must be a king."

Blade Runner: "It's too bad she won't live...but then again, who does?"

Schindler's List: At the end, where he collapses and starts crying about the things he's wearing that he might have saved one more. One of the most moving scenes ever filmed.

Clockwork Orange: Where they're forcing him to watch the brainwashing films and he freaks out that they're using Beethoven's 5th because he knows he'll never be able to hear it again.

Apocalypse Now: "I love the smell of Napalm in the morning. Smells like...victory."
and, of course, the scene preceding the line with "Ride of the Valkyries" during the strike.

The Man Who Would Be King: Near the end, when they march Sean Connery onto the bridge and he and Danny (Michael Caine) begin singing until the bridge falls.

I could go on all day!