Leonard: So it sounds like we need a way to communicate that's simple.
Raj: And doesn't require outside machinery to be built to access it.
Leonard: It's also a problem because we don't even know if the aliens who find this can see. I mean, they might communicate in a totally different way than us.
Raj: Like when my dog is mad at me, she tells me by peeing in my slippers.

Sheldon: So, often on the front of the locomotive is a large iron wedge for clearing objects off the tracks. Now, while commonly known as a cowcatcher, I prefer the more accurate "cow exploder."

Sheldon: Just out of curiosity, why didn't you ask Leonard for advice about this?
Penny: Urgh, because I already know what he'll say. Wah, wah, wah. You shouldn't do it.
Sheldon: Ah, it's just like he's here.

Leonard: That's actually a valid example. Animals do deliver messages through scent.
Raj: Bees talk to each other by dancing. Whales have their songs.
Leonard: Penny has about 20 different ways of rolling her eyes that each mean something different.

Howard: You don't think I'm a leader?
Bernadette: I was kidding. Of course you are.
Howard: Right. I couldn't change if I wanted to.
Bernadette: You better not change, because I love who you are. Now, will you need help cleaning all this up when you're done or can you do it all by yourself?
Howard: All by myself.
Bernadette: There's my big boss man.

Sheldon: Hey, would you like to hear some songs I've rewritten to get children interested in the hard sciences?
Howard: Sure.
Leonard: Really?
Howard: Yeah. I like music. I like science. I like making fun of Sheldon. Hit it!

Leonard: Wait a minute. Sheldon spent a whole day with James Earl Jones and never told any of us.
Sheldon: I sure did. My goodness. From Jabba's head to ice cream with Darth Vader, I'm having a heck of a ride.

Raj: Look. I know you guys are upset, but we've talked about it and we think it would be beneficial for you to be part of the project.
Howard: Well. Well. Well. Did you hear that Sheldon?
Sheldon: I'm sorry. I was trying to think of what rhymes with Nose of the Aardvark.

Sheldon: Clearly, good things happen when I'm in charge. Now, why don't you boys step aside, let me knock this project out.
Leonard: Sheldon, you're not in charge. Raj is in charge.
Sheldon: Leonard, who's really in charge? The person in charge or those who put him in charge.
Raj: He's right. If you think about it, we're all in charge.
Sheldon: No, the guy in charge is in ch-. Why is everyone so bad at these?

Bernadette: I'm glad you have a new appreciation for you job.
Penny: I do. And you know, I don't think I've ever thanked you properly for helping me get it.
Bernadette: Properly? At all? It's just words I've never heard.

Sheldon: Greetings from Planet Earth. Just turn left at Alpha Centauri. You can't miss it.

Sheldon: How about we split the difference and discuss why Austria was an arch-duchy and not just a regular duchy?

Penny: If I was at a train station and one train could take me to my current job and the other train could take me to an audition for a movie, which train should I get on?
Sheldon: Are you using trains to trick me into giving you advice?
Penny: No.
Sheldon: All right then. You should take a third train where you audition for the movie, but hold off on making a career decision until you have more information.

Bernadette: Now you're making some real money, maybe you can take your friend out for a nice thank you dinner.
Penny: Sure.
Amy: And you probably have to invite your other friend because she overheard you talking about it and it would be awkward to exclude her.
Penny: Yeah, okay.
Bernadette: How about now?
Penny: All right.
Bernadette: Don't forget your wallet.

Howard: Now if we're talking about being left out, you guys went to Skywalker Ranch without us.
Sheldon: Oh, I recommend that too. That was a magical experience.