Howard: I promise I'll be on my best behavior.
Raj: You better be. No jokes about how close I am with my dog. Or the truth about how close I am with my dog.

Sheldon: Do you think he's right? Am I wasting my life on a theory that can't be proved?
Howard: Maybe. But how great is Game of Thrones?

Sheldon: I couldn't sleep.
Penny: I told you those Walking Dead pillows were a bad idea.

Leonard: How's dating two women going?
Raj: Umm, kinda hit a bump. When I was honest and told Emily she wasn't the only person I was seeing, it went great. So I tried the same thing with Lucy.
Howard: And?
Raj: She had mixed feelings. But when I said "Emily was cool with it, Emily's the best, why can't you be more like Emily?", those feelings became less mixed.

Howard: I hope I can meet her as soon as possible.
Raj: Why the rush? She isn't going anywhere.
Howard: Oh, she is. But I like that attitude!

Penny: I get it. I know what it's like to put your heart and soul into something and get nothing out of it.
Sheldon: You mean your acting career?
Penny: No.
Sheldon: Your relationship with Leonard?
Penny: No.
Sheldon: Your failed attempt to go back to college?
Penny: No!

Raj: Being an astrophysicist right now is like being a rock star.
Howard: Only without the sex.
Raj: Yeah, literally none of it.

Raj: This maybe the biggest scientific breakthrough of our life time. How can you as a theoretical physicist not care about this?
Sheldon: Maybe it's because I'm not an elitist. What I'd like to know is how does this gravity wave breakthrough help the man on the street? Who's looking out for Joe six-pack and all his quantum physics concerns?

Sheldon: Why would you do that? You're a string theorist as well.
Barry Kripke: Incorrect. I'm a string pragmatist. I say I'm going to prove something that can not be proved. I apply for grant money and then I spend it on liquor and broads.

Sheldon: Well, I've had a lot on my plate. We happen to live in a golden age of television.

Barry Kripke: Excuse me, fellas. Sorry for eavesdropping, but there actually was some big string theory news out of the Hadron Collider.
Sheldon: Really? Did they find evidence to support extra dimensions or super-symmetry?
Barry Kripke: No, but they did find evidence you'll believe anything

Wil Wheaton: Penny? We're working together. Awesome!

Sheldon: I had the same feeling when I made my dad buy a betamax instead of a VHS.
Amy: You were just a little kid.
Sheldon: A little kid who picked the wrong format to record the MacNeil/Lehrer Report.

Sheldon: I also was certain HD-DVD would win out over Blu-ray.
Amy: How old were you then?
Sheldon: Old enough to know better!

Sheldon: And now that I think about it. I stood in front of a case of iPods and I bought a Zune.
Amy: What's a Zune?
Sheldon: Exactly! It's an MP3 people brought to us by the makers of Xbox.