Memorable quotes, in the order they appear in the film. The spoilerish quotes are in white (and there's pages missing...), so you'll have to highlight them to read them (...I wonder why these are crossed out?).

Leonard: I have this condition.
Burt: A condition?
Leonard: It's my memory.
Burt: Amnesia?
Leonard: No, no, no, no, it's different from that. I have no short term memory. I know who I am, I know all about myself, I just... since my injury, I can't make new memories. Everything fades. If we talk for too long, I'll forget how we started and the next time I see you, I'm not gonna remember this conversation. I don't even know if I've met you before. So if I seem a little strange, or rude or something, uh... I've told you this before, haven't I?

Burt: Well, what's the last thing you remember?
Leonard: My wife.
Burt: What's it like?
Leonard: It's like waking. It's like you just woke up.
Burt: That must suck. It's all backwards. Like, maybe you got an idea about what you wanna do next, but you don't remember what you just did.

Natalie: It must be tough living your life off a couple of scraps of paper. You mix your laundry list with your grocery list you'll end up eating your underwear for breakfast.

Natalie: Even if you get revenge, you're not going to remember it. You're not even going to know that it happened.
Leonard: My wife deserves vengeance. Doesn't make any difference whether I know about it. Just because there are things I don't remember, doesn't make my actions meaningless. The world doesn't just disappear when you close your eyes, does it? Anyway... maybe I'll take a photograph to remind myself. Get another "freaky" tattoo.

Leonard: She was beautiful... to me she was perfect.
Natalie: No. Don't just recite the words. Close your eyes, and remember her.
Leonard: You can just feel the details; the bits and pieces you never bothered to put into words. And then you can feel these extreme moments, even if you don't want to. Put these together and you get the feel of a person... and have to know how much you miss them... and how much you hate the person who took them away.

Leonard: Sammy Jankis wrote himself endless notes. But he'd get mixed up. I've got a more graceful solution to the memory problem. I'm disciplined and organized. I use habit and routine to make my life possible. Sammy had no drive. No reason to make it work. Me? Yeah, I got a reason

Teddy: You can't trust a man's life to your little notes and pictures.
Leonard: Why not?
Teddy: Because, your notes can be unreliable.
Leonard: Memory is unreliable. No, really. Memory's not perfect, it's not even that good. Ask the police, eyewitness testemony is unreliable. The cops don't catch a killer by sitting around remembering stuff, they collect facts, they make notes, and the draw conclusions. Facts, not memories. That's now you investigate. I know, it's what I used to do. Look, memory can change the shape of a room, it can change the color of a car. And memories can be distorted. They're just an interpretation, they're not a record, and they're irrelevant if you have the facts.

Leonard: So how many rooms am I checked into in this shithole?
Burt: Just two. So far.
Leonard: Well, at least you're being honest about ripping me off.
Burt: Well, you're not gonna remember anyway.
Leonard: You don't have to be that honest, Burt.
Burt: Leonard, always get a receipt.
Leonard: Oh yeah. I'll write that down.

Leonard: You know, I can remember so much. The feel of the world... and her. She's gone. And the present is trivia which I scribble down as fucking notes.

Leonard Shelby: I don't even know how long she's been gone. It's like I've woken up in bed and she's not here because she's gone to the bathroom or something. But somehow I just--I just know she's never gonna come back to bed. If I could just reach over and touch her side of the bed, I would know that it was cold, but I can't. I know I can't have her back... but I don't want to wake up in the morning, thinking she's still here. I lie here not knowing how long I've been alone. So how... how can I heal? How am I supposed to heal if I can't feel time?

Teddy: Ya know, I've had more rewarding relationships that this one... although I do get to keep telling the same jokes.

Leonard: I don't think they'd let someone like me carry a gun.
Teddy: Fuckin' hope not.

Natalie: Get rid of Dodd for me.
Leonard: What?
Natalie: Kill him. I'll pay you.
Leonard: What do you think I am? I'm not gonna kill someone for money!
Natalie: What then? Love? What would you kill for? You'd kill for your wife, wouldn't you?

Natalie: You know what? I'm gonna use you. I'm telling you now because I'm gonna enjoy it so much more if I know that you could stop me if you weren't such a fucking freak. Did you lose your pen? That's too bad, freak. Otherwise, you could write yourself a little note about how much Natalie hates your retarded guts and that I called your wife a fucking whore.

Natalie: I read about your condition, Leonard. You know what one of the causes of short term memory loss is? Venereal disease. Maybe your cunt of fucking a wife sucked one too many diseased cocks and turned you into a fucking retard. You sad, sad freak. I can say whatever the fuck I want, and you wont remember. We'll still be best friends. Maybe even lovers.

Leonard: I always thought the pleasure of reading a book was in wanting to know what happens next.

Leonard: I've done this before. I've probably burned truckloads of your stuff. I can't remember to forget you.

Natalie: What's the last thing that you do remember?
Leonard: My wife...
Natalie: That's sweet.
Leonard: ...dying. I remember my wife dying.

Teddy: So you lie to yourself to be happy, we all do it. Who cares if there's a few details you'd rather not remember.
Leonard: What the fuck are you talking about?
Teddy: I don't know... your wife suviving the assult. Her not believing your condition. The torment and pain and anguish tearing her up inside. The insulin.
Leonard: That's Sammy, not me. I told you about Sammy.
Teddy: Yeah, right. Like you tell yourself over and over again, conditioning yourself to remember. Learning through repetition.
Leonard: Sammy let his wife kill herself, Sammy wound up in an institution...
Teddy: Sammy was a con man, a faker.
Leonard: I never said Sammy was faking.
Teddy: You exposed him for what he was: a fraud.
Leonard: But I was wrong, that's the whole point! You see, Sammy's wife came to me--
Teddy: Sammy didn't have a wife! It was your wife who had diabetes.
Leonard: My wife wasn't diabetic.
Teddy: You sure?

Teddy: Come on, you got your revenge! Enjoy it while you still remember. What difference does it make whether he was your guy or not?
Leonard: It makes all the difference.
Teddy: Why? You're never gonna know.
Leonard: Yes I will.
Teddy: No, you won't.
Leonard: I will. Somehow, I'll know.
Teddy: You won't remember!
Leonard: When it's done, I will know, it'll be different.
Teddy: Well I thought so too! In fact, I was sure of it, but you didn't! That's right, the real John G. I helped you find him over a year ago. He's already dead.

Teddy: You don't want the truth. You make up your own truth. Like your police file. It was complete when I gave it to you. Who took out the twelve pages?
Leonard: You, probably.
Teddy: No. It wasn't me, see, it was you.
Leonard: Why would I do that?
Teddy: To create a puzzle you could never solve?

Teddy: I'm the one that has to live with what you've done. I'm the one who put it all together. You, you wander around, you're playing detective, you're living a dream, kid. A dead wife to pine for; a sense of purpose to you life; a romantic quest that you wouldn't end, even if I wasn't in the picture!

Teddy: You know what time it is? It's beer o'clock, I'm buying.

Leonard: I'm not a killer. I'm just someone who wanted to make things right. Can I just let myself forget what you've told me? Can I just let myself forget what you've made me do? You think I just want another puzzle to solve? Another John G. to look for? You're a John G... so you can be my John G. Do I lie to myself to be happy? In your case Teddy... yes I will.

Leonard: I have to believe in a world outside my own mind. I have to believe that my actions still have meaning, even if I can't remember them. I have to believe that when my eyes are closed, the world's still there. Do I believe the world's still there? Is it still out there?... Yeah. We all need mirrors to remind ourselves who we are. I'm no different. Now... where was I?