- Arthur Fleck: [written in notebook] The worst part of having a mental illness is people expect you to behave as if you don't.
- Arthur Fleck: You don't listen, do you? I don't think you ever really hear me. You just ask the same questions every week. "How's your job?" "Are you having any negative thoughts?" All I have are negative thoughts.
- Arthur Fleck: For my whole life, I didn't know if I even really existed. But I do, and people are starting to notice.
- Arthur Fleck: Murray, one small thing?
- Murray Franklin: Yeah?
- Arthur Fleck: When you bring me out, can you introduce me as Joker?
- [last lines]
- Arkham Psychiatrist: What's so funny?
- Arthur Fleck: I'm just thinking of a joke.
- Arkham Psychiatrist: Do you want to tell it to me?
- Arthur Fleck: You wouldn't get it.
- Arthur Fleck: How 'bout another joke, Murray?
- Murray Franklin: No, I think we've had enough of your jokes.
- Arthur Fleck: What do you get...
- Murray Franklin: I don't think so.
- Arthur Fleck: ...when you cross...
- Murray Franklin: I think we're done here now, thank you.
- Arthur Fleck: ...a mentally ill loner with a society that abandons him and treats him like trash?
- Murray Franklin: Call the police, Gene, call the police.
- Arthur Fleck: I'll tell you what you get! You get what you fuckin' deserve!
- [Joker shoots Murray in the head, killing him instantly]
- Arthur Fleck: I killed those guys because they were awful. Everybody is awful these days. It's enough to make anyone crazy.
- Arthur Fleck: Ugh, why is everybody so upset about these guys? If it was me dying on the sidewalk you'd walk right over me! I pass you everyday and you don't notice me! But these guys? Well because Thomas Wayne would cry about them on TV?
- Arthur Fleck: I've been the man of the house for as long as I can remember. I take good care of my mother.
- Murray Franklin: All that sacrifice, she must love you very much.
- Arthur Fleck: She does. She always tells me to smile and put on a happy face. She says I was put here to spread joy and laughter.
- Arthur Fleck: Have you seen what it's like out there, Murray? Do you ever actually leave the studio? Everybody just yells and screams at each other. Nobody's civil anymore. Nobody thinks what it's like to be the other guy. You think men like Thomas Wayne ever think what it's like to be someone like me? To be somebody but themselves? They don't. They think that we'll just sit there and take it, like good little boys! That we won't werewolf and go wild!
- Arthur Fleck: I know it seems strange, I don't mean to make you uncomfortable. I don't know why everyone is so rude; I don't know why you are. I don't want anything from you. Maybe a little bit of warmth, maybe a hug, dad? How about just a little bit of fucking decency!
- Social Worker: They don't give a shit about people like you, Arthur. And they really don't give a shit about people like me either.
- Arthur Fleck: You're awful, Murray.
- Murray Franklin: Me? I'm awful? How am I awful?
- Arthur Fleck: Playing my video. Inviting me on the show. You just wanted to make fun of me. You're just like the rest of them!
- Arthur Fleck: Comedy is subjective, Murray, isn't that what they say? All of you, the system that knows so much: you decide what's right or wrong the same way you decide what's funny or not.
- Arthur Fleck: I've got nothing left to lose. Nothing can hurt me anymore. My life is nothing but comedy.
- Arthur Fleck: Knock knock.
- Murray Franklin: Who's there?
- Arthur Fleck: It's the police, ma'am! Your son's been hit by a drunk driver. He's dead!
- Sophie Dumond: Were you following me today?
- Arthur Fleck: Yeah.
- Sophie Dumond: I thought that was you. I was hoping you'd come in and rob the place.
- Arthur Fleck: I have a gun. I could come by tomorrow?
- Sophie Dumond: You're so funny, Arthur.
- Arthur Fleck: I don't want you worrying about money, mom. Or me. Everybody's telling me that my stand-up's ready for the big clubs.
- Arthur Fleck: When I was a little boy and told people I was going to be a comedian, everyone laughed at me. Well, no one's laughing now.
- Arthur Fleck: Gary?
- Gary: Yeah?
- Arthur Fleck: You were the only one who was ever nice to me.
- Arthur Fleck: [he kisses him on the head] Get out.
- Card: Forgive my Laughter: I have a Condition.
- Murray Franklin: Do I understand that you did this to start a movement? To become a symbol?
- Arthur Fleck: Oh come on, Murray. Do I look like the kind of clown that could start a movement? I killed those guys because they were awful. Everybody is awful these days. It's enough to make everyone crazy.
- Murray Franklin: Okay, so that's it? You're crazy, that's your defence for killing three young men?
- Arthur Fleck: No. They couldn't carry a tune to save their lives.
- Open Mic Comic: I think most women look at sex like buying a car. You know, like, "Can I see myself in this long term?" "Is it safe?" "Is it reliable?" "Could it kill me?" Most guys look at sex like parking a car. We're like, "There's a spot". "There is another spot, that would work." "Oh, I have to pay? - Never mind." "Handicapped? - Hope no one sees us."
- Thomas Wayne: What kind of coward would do something that cold-blooded? Someone who hides behind a mask. Someone who is envious of those more fortunate than themselves, yet they're too scared to show their own face. And until those kinds of people change for the better, those of us who made something of our lives will always look at those who haven't as nothing but clowns.
- Sophie Dumond: Your name's Arthur, right? You live down the hall. I really need you to leave, my little girl's sleeping in the other room. Please...
- Murray Franklin: And finally, in a world where everyone thinks they could do my job, we got this video tape from Pogo's Comedy Club right here in Gotham. Here's a guy who thinks if you just keep laughing, it'll somehow make you funny. Check out this joker.
- Arthur Fleck: You know, I do stand-up comedy. You should maybe come see a show sometime.
- Sophie Dumond: I could do that.
- Murray Franklin: What's with the face? I mean, are you part of the protest?
- Arthur Fleck: No. No, I don't believe any of that. I don't believe in anything.
- Arthur Fleck: Can I ask you a question?
- Carl (Arkham Clerk): Sure?
- Arthur Fleck: How does someone wind up in here? Have they all, all the people committed crimes?
- Carl (Arkham Clerk): Yeah, some have. You know, some are just crazy, pose a danger to themselves and others. Some just got nowhere else to go, don't know what to do, you know?
- Arthur Fleck: Yeah, I hear you, brother. Sometimes I don't know what to do. The last time I ended up taking it out on some people. I thought it was going to bother me, but it really hasn't.
- [Carl looks at him seriously]
- Carl (Arkham Clerk): What's that?
- Arthur Fleck: I fucked up. I've done some bad shit. And I've been thinking real hard about it. It's so hard just to try and be happy all the time.
- Carl (Arkham Clerk): Hey, listen, man, I'm just the administrator assistant. A clerk. You know, all I do is file paperwork. I don't know what to tell you. But you should see somebody.
- [Pulls out Penny's psychiatric file]
- Carl (Arkham Clerk): all right. Here it is. Fleck. Penny Fleck. Let's see.
- [Reads from file]
- Carl (Arkham Clerk): diagnosed by Dr. Benjamin Stoner. Patient suffers from delusional psychosis, and narcissistic personality disorder. Was found guilty of endangerment welfare of her own child
- [Karl hesitates and looks at Arthur]
- Arthur Fleck: What?
- Carl (Arkham Clerk): You said she's your mother?
- [Arthur smiles and nods]
- Carl (Arkham Clerk): Uh, I'm sorry. They said I can't release these records. You know, this is not a public forum. Sorry, I get in trouble. look, if you want to bring your mom here to sign, that'll be much easier, but I can't let this go without a signature. Okay? I'm sorry.
- [Arthur suddenly grabs the file and tries to take it off Carl]
- Carl (Arkham Clerk): No, man! Let go man! Give it back!
- Arthur Fleck: You're just like the rest of 'em!
- Murray Franklin: You don't know the first thing about me, pal. Look at what happened because of you did. What it led to. There are riots out there, two policemen are in critical condition - you're laughing, you're laughing. Someone was killed today because of what you did.
- Arthur Fleck: I know!
- Thomas Wayne: [as Arthur is laughing at him] You think this is funny?
- Arthur Fleck: Dad, it's me! Come on!
- [Mr. Wayne punches Arthur in the face]