Memory loss causes problems. Look at me, I don't even know why I'm sitting here. I think, I think, it has something to do with, um, the thing with the... no, I've forgotten again. I'm glad I don't have anything important to do. Yeah, I'd be rubbish at that. I should just go back to bed, or I might start some elaborate plan that'll only lead to trouble. That might have already happened. I hope I didn't hurt anyone. No, don't be silly. Go back to bed.
Memento seems like the sort of thing a thousand film students have written essays about, discussing all the nuanced bits and bobs of the backwards plot. Take it out of a university seminar and it becomes pretty entertaining. The audience is on the same level as the hero, waking up in each moment not knowing what came before. Look, I almost started writing an essay then. The simple thing to say is that it gets a lot of fun out of its big idea, and that Nolan knows how to keep you right on the edge of being confused.