Originally Posted by persiandog
"don't shoot him , it will just make him angry"
In Avatar the line is "don't shoot, you'll piss him off" spoken by Sigourney Weaver to the protagonist when they are threatened by some huge armored beast.

But I think you may be referring to a different movie.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!