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!

Barry Kripke: I heard the only work he did on his thesis was googling, "Where can I buy a thesis?"
Amy: Well, plagiarism is a pretty serious charge. Are you sure?
Barry Kripke: You want proof? I can make some calls.
Sheldon: You'd do that for us?
Barry Kripke: I really don't want to see that guy win a Nobel. I also don't want to see you win a Nobel. Ooh, this is tricky.

Sheldon: Can I feed peanuts to the elephants at your wedding?
Raj: That is such a stereotype!
Sheldon: There won't be any elephants?
Raj: Of course there'll be elephants. It's a stereotype that you feed them peanuts.

Amy: Are you really gonna plan a wedding in three months?
Raj: Yeah, well, her family's doing most of the work. They're amazing. We talk all the time.
Sheldon: Why?
Raj: Because we're about to get married and they're gonna be my family.
Sheldon: Amy and I are married, and I never talk to her family.
Penny: Really? My parents love Leonard.
Leonard: Yeah. And my mom loves Penny, which is weird, because I never knew she could love.

Bernadette: And my dad has grown to really like Howard.
Howard: Yeah, there's a nice coolness between us.

Raj: Wait, wait, wait. If Tam knows what he did, we can just ask him. He's gonna be on campus tomorrow showing his son around.
Leonard: Won't that make Sheldon mad?
Raj: Everything makes Sheldon mad.
Howard: Yeah. Look at his list. Jim Henson for, quote, "putting a terrifying, giant yellow bird on television and in my nightmares."

Penny: It's fine, I'll sit on the floor.
Raj: Thank you, Penny. And, Leonard, I was kind of hoping I could sit next to Anu.
Leonard: So now I have to sit on the floor? It's my house. Why can't Sheldon sit on the floor?
Sheldon: That might be the dumbest thing you've ever said.

Howard: Guys, guys, there's a simple solution.
Raj: I am not breaking up with her.
Howard: All right. Let's keep thinking.

Barry Kripke: Greg Pemberton, you old so-and-so.
Dr. Pemberton: Very good to see you. Uh, let me introduce you to my colleague, Dr. Campbell. Uh, Kevin, this is Barry Kripke. We went to college together.
Dr. Campbell: Great to meet you.
Barry Kripke: Well, you have my number. We should hit up the buffet at the strip club while you're in town. Nothing beats a lap dance and a baked potato bar, huh?

Howard: I wonder what Tam could have done.
Raj: Hmm. Well, if Sheldon doesn't want to talk about it, it's got to be pretty upsetting.
Howard: I have his brother George's number, he might know.
Leonard: Really? You have George's number?
Raj: So so jealous!

Howard: Not to brag, but I'm an astronaut, so I've been weightless before. Can be pretty scary.
Bernadette: Please, I'm, like, 90 pounds. I'm weightless every time I hold more than three balloons.

Amy: Well, you know that my mom can be well, difficult to get along with.
Sheldon: Which is why I'm starting with your dad and working my way up.
Amy: All right. I'm just worried you might have a rather unpleasant day.
Sheldon: Yeah, back at ya. I watched the trailer for The Grinch, it looks terrible.

Sheldon: After last night, I got to thinking that I should have a better relationship with your family.
Amy: I think the one you have with them is perfect.
Sheldon: I hardly have one at all.
Amy: Which is perfect.

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: We should invite him to come play with us.
Sheldon: Ask him to bring some chips because we're all out.
Leonard: Hey, Wil, this is Leonard.
Sheldon: Make it Bugles. No, no, no, no, no, pretzel sticks. No, no, no, Bugles.