Brennan: Doctor Sweets says that you work with tropical fish.
April: Yes, I lo-ove fish. They're just like people.
Brennan: No, no, they're not. Actually, people can't breathe under water.
April: She's funny.
Brennan: I am? Wha... ? Why is that funny?
Booth: I don't think she meant that literally, Bones.
Brennan: Oh.
April: You look in their eyes and you can see their little souls. It's in every part of their coloring.
Brennan: Fish don't have souls.
Sweets: [obviously trying to end the conversation gracefully] April just means they're pretty.
April: [starting to get angry] Don't tell me what I mean, Lance. [To Brennan] What I meant was, we're all made up of the same stuff; that makes us human.
Brennan: Well, on a quantum level, that's true. Although the word "stuff" is not accurate.
April: [To Sweets] See?
Sweets: [shocked] O-okay.
April: He kills about a million people a night!
Sweets: In a video game.

Brennan: Does Tommy share your affection?
Pam: Why do you ask it like that? Because I don't look like a scarecrow? [to Booth] Like her?
Brennan: Hey. Wha- what are you coming after me for? [to Booth] Do- do I look like a scarecrow?

Brennan: Hey! Break down the door!
Booth: It hurts my shoulder when I break down the door!

Brennan: I knew I shouldn't have gone to that funeral. It was a complete waste of time, just like I said.
Booth: Wait a second. You thought that my funeral was a waste of time?
Cam: I thought it was a lovely service, Booth.
Booth: Thank you! You know, I expected to see more people though...
Hodgins: I always imagined a lot of ex-girlfriends crying.
Booth: Yeah. Me, too.
Angela: You guys are pathetic.
Brennan: [to Booth] Just know I won't be attending your next funeral.

Brennan: I thought you said you were just going to talk to him!
Booth: Yeah, well, I saw his face and I got mad.

Brennan: Is she crying because she loved him, or because she lost a mansion?
Booth: [mouths] The mansion.

Brennan: Strontium is an element found in most rocks.
Hodgins: Human beings absorb it through the consumption of local vegetation and water. Over time the isotope collects in the bones, meaning--
Booth: You could use it to figure out where someone's from. [Brennan and Hodgins look shocked.] That's right, people. I am a constant surprise.

Brennan: Until I was thirteen, I wanted to be the next Cyndi Lauper.
Booth: I'd say you're kidding, but I don't think you know how to kid.
Brennan: The other girls and I referred to her as "rad." [laughs] My mother said I sang just as well.
Booth: As well as Cyndi Lauper?
Brennan: Yes.
Sweets: Mothers do that. It's healthy.
Brennan: No, it wasn't just flattery. My mother told me I sang "Girls Just Wanna Have Fun" better than she did.
Sweets: It was an expression of affection, Dr. Brennan, not an objective evaluation of your abilities.
Brennan: Well, I think you're wrong.
Booth: Okay then, go ahead, belt it out.
Brennan: No!
Sweets: Yeah, come on. Give us a few bars.
Booth: Come on...
Brennan: I can't just burst into song. I have to have music and an appropriate atmosphere of frivolity.
Booth: Diva, forensic genius, best-selling author, better than Cyndi Lauper...

Brennan: "He who smelt it, dealt it."
Booth: How do you even know that phrase?

Brennan: (Booth is walking around the lab table, staring) Booth?
Booth: Hey Bones, I'm thinking here.
Brennan: Thinking about what, exactly?
Cam: Well, it's a pickle. The platform's a crime scene, but we need to access it to investigate the crime.
Angela: A "cake and eat it too" situation.
Zack: Is it a cake or a pickle?
Hodgins: It's Schrödinger's Cat.
Zack: That I understand. Cakes and pickles meant nothing to me.

Brennan: [confronting Sweets in an angry whisper] You think I don't recognize an experiment when I see one? You experimented on us.
Sweets: Beg your pardon?
Brennan: Not telling me Booth was alive, you wanted to quantify our reactions for your own research. You took advantage of us. Booth and I agreed to let you observe us. We did not agree to be used as lab rats, so you better cut it out.
Sweets: Dr. Brennan, why are you talking so fast?
Brennan: Because if Booth hears why you did what you did, he'd beat you up.
Sweets: Don't you think that would be an overly aggressive act?
Brennan: Not at all. So you better not do it again.

Brennan: [to Zack and Hodgins] Who's stronger? Catwoman or Wonder Woman?
Zack and Hodgins: [together spontaneously] Wonder Woman.
Brennan: I concur, vehemently!

Brennan: How did this skull get here?
Booth: Ask our eyewitness. [runs off] Let's go, buddy. [brings a teenage boy over to Brennan]
Boy: I am not high.
Brennan: Neither am I. Why is he telling me that?

Brennan: I can't freak out every time somebody Googles me.
Booth: Cam, she goes nowhere alone.
Brennan: Cam, don't listen to him.
Booth: Cam, who are you more afraid of, me or her?
Brennan: Booth--
Cam: Whoa! [holds up a hand] So this is what it's like to be a kindergarten teacher.

Brennan: I've always been proud of you, Zack. I've never met anyone more rational and intelligent. But there's a fault in your logic.
Zack Addy: With all due respect, you aren't cognizant of his logic.
Brennan: Assumption number one: Secret societies exists.
Zack Addy: Accepted. Hodgins has been explaining this to me for years.
Brennan: Assumption number two: The human experience is adversely affected by secret societies.
Zack Addy: Accepted.
Brennan: Assumption number three: Attacking and killing members of secret societies will have ameliorating affect on the human experience.
Zack Addy: Accepted.
Brennan: All of your assumptions are built on a first principle, Zack. To wit, the historical human experience as a whole is more important than a single person's life.
Zack Addy: Yes.
Brennan: Yet, you risked it all so you wouldn't hurt Hodgins.
[Brennan moves closer to Zack and touches her forehead with his as both their eyes tears up.]
Zack Addy: There's... You're correct. There's an inconsistency in my reasoning.
Season 4