I'm thinking of this one...
D-Day: War's over, man. Wormer dropped the big one.
Bluto: Over? Did you say "over"? Nothing is over until we decide it is! Was it over when the Germans bombed Pearl Harbor? Hell no!
Otter: Germans?
Boon: Forget it, he's rolling.
Bluto: And it ain't over now. 'Cause when the goin' gets tough... [thinks hard]
Bluto: the tough get goin'! Who's with me? Let's go! [runs out, alone; then returns]
Bluto: What the f*** happened to the Delta I used to know? Where's the spirit? Where's the guts, huh? "Ooh, we're afraid to go with you Bluto, we might get in trouble." Well just kiss my a** from now on! Not me! I'm not gonna take this. Wormer, he's a dead man! Marmalard, dead! Niedermeyer...
Otter: Dead! Bluto's right. Psychotic, but absolutely right. We gotta take these bastards. Now we could do it with conventional weapons that could take years and cost millions of lives. No, I think we have to go all out. I think that this situation absolutely requires a really futile and stupid gesture be done on somebody's part.
Bluto: We're just the guys to do it.
D-Day: Let's do it.
Bluto: LET'S DO IT!
John Belushi for President