- Penny: [knock, knock, knock] Sheldon!
- [knock, knock, knock]
- Penny: Sheldon!
- [knock, knock, knock]
- Penny: Sheldon!
- Sheldon Cooper: I bet that started off as a joke, but by the third one, you realized there was something strangely enjoyable about it.
- Penny: Yeah, I kind of want to do it again.
- Sheldon Cooper: I don't recommend it, you'll be doing it the rest of your life.
- Raj Koothrappali: You guys know the new discovery class missions that NASA's been working on?
- Howard Wolowitz: Yeah.
- Raj Koothrappali: Well, they're looking to include a message from Earth in case one of them is encountered by alien life.
- Leonard Hofstadter: When I encountered alien life, I discovered that the key thing was not to sit in its spot.
- Sheldon Cooper: You can't breathe our air without an inhaler. He's allergic to Earth nuts, but I'm the alien.
- Penny: You are a wise man.
- Sheldon Cooper: Well, Penny, who's smarter, the wise man or the person who comes to him for advice?
- Penny: Oh, I guess you're right. Maybe it is the person who asks.
- Sheldon Cooper: No, it's the wise man.
- Sheldon Cooper: [singing] The itsy bitsy spider is not an insect at all. Because it has eight legs and two body parts.
- Leonard Hofstadter: That's pretty cool, Sheldon.
- Sheldon Cooper: Thank you. Do either of you know Beyoncé? I'd love her to get behind it.
- Bernadette Rostenkowski: What's going on in here?
- Howard Wolowitz: I am making molecular cocktails. This sphere is actually a cosmopolitan.
- Bernadette Rostenkowski: Oh. How do you drink it?
- Howard Wolowitz: Just put it in your mouth and pop it like a zit.
- Howard Wolowitz: So I have a dominant personality. We all know that.
- Bernadette Rostenkowski: I'm sorry, what do we know?
- Howard Wolowitz: In social groupings, I just naturally wind up in charge.
- Bernadette Rostenkowski: Don't take this the wrong way, but how many of these little booze balls have you had?
- Leonard Hofstadter: Now that we're all on the same page, let's get together tonight and work on it.
- Sheldon Cooper: Get together tonight? Leonard, stop trying to control everything, and give poor Raj a chance to come up with what we should do. Go ahead, Raj.
- Raj Koothrappali: Okay, I think we should do it right now.
- Sheldon Cooper: Tonight works better for me.
- Leonard Hofstadter: That's actually a valid example. Animals do deliver messages through scent.
- Raj Koothrappali: Bees talk to each other by dancing. Whales have their songs.
- Leonard Hofstadter: Penny has about 20 different ways of rolling her eyes that each mean something different.
- Sheldon Cooper: 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."