In my language I can say "I don't remember I've ever watched that film" or "Never in my life have I remembered watching that film" to suggest that as far as I can remember I've never done something, or in a stronger sense that I can recall I never did something.
Do you, as a native speaker, use "don't remember" in such sense? Otherwise, what is the natural way to put it across?
Edit: Thanks guys for your inputs, but I still have a question. Let's say somebody told you your friend Ken has a ring, but as far as you know or could recall he doesn't have one. My immediate response would be like "Oh? But I don't remember he ever has a ring" Would this be okay? I know how it sounds, it may sound like I just forgot the fact that he has a ring. What would be a commonly used expression for such situation?