Raj: Hey, don't freak out, but I think there's someone in your playhouse.
Howard: Oh. Yeah, that's just Bernadette. She's been hiding out in there all week.
Raj: Really? Why?
Howard: I don't know. She's been a little overwhelmed at work. And, frankly, me and the kids are a lot. She just needs some downtime.
Raj: And you just pretend like you don't know?
Howard: Sure. That's how marriage works. Three years ago, I told her I got life insurance, and I totally didn't. (laughs) Someday, she's gonna find out. I'm gonna say, "Ha-ha! I know you've been hiding in the playhouse."
Raj: Why don't you just get the life insurance?
Howard: Whose side are you on?

[in the playhouse:]
Amy: Can you hear what they're saying?
Bernadette: Shh, I'm trying.
(cork pops)
[in the hot tub:]
Howard: Huh. Sounds like Penny's in there, too.

Raj: Seriously, Leonard, you didn't pick my project?
Leonard: I'm sorry, Raj.
Howard: Did you go with Crow Lady?
Leonard: No.
Sheldon: You gave the money to Kripke?
Leonard: I did not.
Raj: Wait, I'm confused. I thought there were only three projects in contention.
Leonard: There were. But, at the last minute, someone submitted an application for a pretty cool europium-doped laser, and they made a very compelling case.
Howard: What was the case?
Leonard: Oh, that it was me and I wanted it.
Raj: You-you can't do that. You can't just fund your own project.
Leonard: Uh, it turns out I can, and I did.

Sheldon: Interesting. What about not wanting everybody to be mad at you?
Leonard: Well, I realized that, no matter what decision I made, people were gonna be mad at me. And this way, I get a laser.
Sheldon: That is the most selfish thing you've ever done. I'm proud of you.
Leonard: And I don't care.
Sheldon: Yes, you do.
Leonard: Yeah, I do.

Leonard: The europium laser is so cool. It has a four-level f-f transition which provides for high power output, and its quantum efficiency is off the charts.
Sheldon: What are you going to use it for?
Leonard: I have no idea.
Sheldon: Leonard, there's a crow on your roof.
Leonard: I see it.
Sheldon: Is that one of Dr. Lee's crows?
Leonard: It has a tag on its leg.
Sheldon: Don't make any sudden moves.
Leonard: Smart. Let's stand perfectly still and-
Sheldon: [running away] He's the one you want!

Raj: Hey, did you guys know this year's the 40th anniversary of Halloween?
Sheldon: Oh, nonsense. Halloween traditions of date back to the Celtic festival of Samhain. Although our current Halloween customs come from the evening before All Hallows' Day, All Hallows' Eve. Thus, Halloween.
Raj: I meant the movie Halloween.
Sheldon: Oh. Well, that's not interesting at all.
Leonard: Did you know the Michael Myers mask from the film was actually a Captain Kirk mask turned inside out?
Sheldon: Okay, now it's interesting.

Amy: Are you guys all dressing up for work?
Howard: Of course. I mean, how often do you get to wear costumes to work?
Penny: Says the man with a giant belt buckle and a dickey.
Howard: Hey, this is not a costume. It's a choice. It's a style.
Penny: It's a tragedy.

Penny: Bernadette, why don't we get to dress up at work?
Bernadette: We used to, but a couple guys in the infectious disease lab went as zombies and it triggered a quarantine. The CDC was so mad.

Leonard: Hey, if you really want to dress up, we could throw a party.
Penny: Oh, that would be fun. You know, I used to throw Halloween parties all the time when I moved into the building.
Leonard: All the time? I only remember being invited to one.
Penny: Please don't make this awkward for me.

Amy: What are you going as?
Howard: I don't want to ruin the surprise. You'll see it at work. Just a warning: it's pretty scary.
Sheldon: Is it a bird?
Howard: No.
Sheldon: Is it a dog?
Howard: No.
Sheldon: Oh, I think I'll be fine, then.

Howard: Hello. [dressed like Sheldon, imitating him]
Sheldon: Hello.
Howard: I see you are dressed as Doc Brown from Back to the Future. May I assume that Amy is going as his wife, Clara Clayton, from Back to the Future Part III?
Sheldon: She is. Did you do something different to your hair?
Howard: Yes.
Sheldon: Looking good.

Sheldon: Oh, Inspector Gadget. And I want to say Supreme Court Justice Ruth Bader Ginsburg.
Raj: So close. Kooth Bader Ginsburg. The Notorious KBG.
Sheldon: That's very clever.
Raj: [striking a gavel] Sustained.

Leonard: Are you gonna dress in drag in front of your fiancee?
Raj: Yeah. We have no secrets from each other. Well, except for the fact that I crocheted this myself.

Leonard: Oh, my God, you look amazing.
Raj: I find you guilty of murder, because you are killing it.
Howard: (imitating Sheldon) Well, technically, the Supreme Court wouldn't determine a defendant's guilt or innocence in a criminal matter. They could only reverse or revamp a jury's conviction based on a constitutional or statutory issue.

Howard: You're sitting in my spot.
Sheldon: You don't have a spot. What is wrong with you today?
Raj: Maybe he's cranky because he's off his bathroom schedule.