How well do you know your Flynn films?

I think that I mentioned before that sometimes sentences from Errol's films pop up in my mind, and the last sentence inspired me for this question. It took me quite a while to figure out where it came from – you will probably be faster. So please show us how well you know his films:

From which film comes the sentence: “I meant yours – certainly not mine.” and who said it?

I'm sure you will come up with the answer very quickly. Good luck guessing.