Amy: Well, maybe this is the perfect opportunity to take some time for yourself and refocus. I'm sure you'll find something you're excited about.
Sheldon: Thank you, Amy. I don't know what I'd do without you.
[cut to Amy entering Apartment 4A]
Amy: Hey, can I stay here? Sheldon kicked me out.

Sheldon: Okay. Scratch paper, check. Whiteboard, check. Chex Mix, check. And here we go.

Mary Cooper: Hello again.
Sheldon: Who did you see at the barbecue festival?
Mary Cooper: Mr. Watkins.
Sheldon: Really? You called me and interrupted my work to tell me that you ran into somebody you could plausibly run into? I'm sorry, Mother, I really need to focus here. I will speak to you next week.
Mary Cooper: Okay, sweetheart. I'll talk to you then.

Sheldon: (sighs) I thought Mr. Watkins moved to Florida.
Mary Cooper: He did. He was back visiting his son.
Sheldon: Oh, gosh darn it, that is interesting. Was it Tommy or Joe? I bet it was Joe, 'cause he and Tommy had a falling out over that time-share.

Raj: You guys do anything fun after dinner?
Leonard: Well, actually Amy came back over and we hung out. Did you know that we're both spelling bee champs? We stayed up for hours trying to stump each other.
Raj: Who won?
Leonard: Oh, she thought she had me with "appoggiatura" but I shut that down expeditiously. E-X-P-E-D-I-T-I-O-U-S-L-Y. Expeditiously.

Raj: Wow. I bet that made Penny take off all of her clothes. ... Put her pajamas on and then go to bed early.
Leonard: At, like, 9:00.

Howard: I don't want to be the one who breaks up the band. You know, maybe you should think about replacing me.
Raj: Okay.
Howard: I mean, I know it'll be hard since we-
Raj: Oh, I bet Bert could do it. He plays guitar. I'm gonna go ask him.

Leonard: I guess he forgot that I play the cello.
Howard: I-I don't think he did.

Leonard: Okay, I think it's ready.
Amy: Should we put on safety goggles?
Leonard: Well, the funnest fun is the safest fun, so yes.

Penny: So what's all this?
Leonard: Well, Amy and I were talking about old science fair projects, and how fun it would be to recreate them.
Amy: We're making hot ice.
Leonard: It's pretty cool.
Amy: (chuckles) Nice one. (Amy and Leonard high five)

Penny: No, no, you guys do your experiments. I'll go pick up dinner.
Leonard: Are you sure?
Penny: Yeah, you're having science fun, and I don't want to interfere, or watch you.

Sheldon: Did I actually do it? I did. I did. [picks up his phone and dials] The answer is one in 18 million.
Mary Cooper: What is?
Sheldon: The odds of you running into Mr. Watkins.

Penny: [3 knocks] Sheldon? [3 knocks] Sheldon? [3 knocks] Sheldon?
Sheldon: It's annoying when you do it.

Sheldon: I have been working pretty hard. I could use a break.
Penny: What's that?
Sheldon: Oh, yeah, that is an experiment to see how many parallelograms I could draw while holding my breath.
Penny: [pointing to the board] Is that where you blacked out?
Sheldon: [pointing behind the couch] No, actually, that's where I blacked out.

Penny: And this?
Sheldon: That is a list of all the different types of natural disasters.
Penny: "Fire-quake"?
Sheldon: I made that one up. Which I shouldn't have, because now I'm scared of it.