Harry Stamper: You got any more bullets in that gun, Sharp?
General Kimsey: We spend $250 billion a year on defence, and here we are! The fate of the planet is in the hands of a bunch of ret*rds I wouldn't trust with a potato gun!
Harry Stamper: The United States Government just asked us to save the world. Anyone wanna say no?
Harry Stamper: AJ, I've got just five words for you: Damn glad to see you boy!
Rockhound: Hey Harry...
Harry Stamper: Yeah, Rock?
Rockhound: You know we're sitting on four million pounds of fuel, one nuclear weapon, and a thing that has 270,000 moving parts, built by the lowest bidder.
Rockhound: Hey, guys, remember: we're, we're heroes now. So that incident with me and the gun on the asteroid. Let's keep that under wraps, all right?
Watts: You don't know the components!
Lev: American components. Russian components. All made in Taiwan!
Harry Stamper: Bear would like to stay at the...white horse?
Bear: White House. White House.
Harry Stamper: Yes, he'd like to stay in the Lincoln Bedroom of the White House for the summer.
Lev: That's why I told you touch nothing, but you bunch of cowboys...
Harry Stamper: [Refering to asteroid right before he blows the nuke.] Complain all you want, you son of a bitch.
Rockhound: Houston, this is a kick-ass ride!
Bear: Just for the record, this is a very bad idea.
A.J.: You ever heard of Evil Knievel?
Lev: No, I never saw Star Wars.
Rockhound: A busted ship, and I'm strapped in here? I had a great spot picked out there!
Answer: If you look at the deleted scenes on the special edition DVD, you will see a deleted scene in which A.J. asks what they needed a gun for, and Max explains that it's for debris elimination, in order to take out small rocks in the way.