Clint Eastwood as Gunnery Sergeant Tom Highway in Heartbreak Ridge as he is leaving the courthouse.

Cop: "I don't give no serviceman's discount"
Eastwood: "Too bad, your old lady does."

Mac

"Sometimes, when things look bad, and it looks like you're not goint to make it, you have to get mean, I mean plumb mad-dog mean. Cause, if you loose your head, and you give up, then you niether live nor win. That's just the way it is." Clint - Josie Wales.

Used when someone is whining, or puping out.

Greg

Forgot my other favorite:

Wife: "I'll be thinking about you...".
John Wayne (With sly grin): "Don't do that, you won't sleep at night".

From "The Cowboys" I think.

Used when my wife says the first part when I'm about to be out of town.

Greg