Leonard: It seems a shame to throw it away.
Penny: Yeah. We could give it to Sheldon and tell him William Shatner painted it.
Leonard: God, I love you. I love you so much.

Amy: I suppose being the first people on a new planet would be incredibly exciting.
Sheldon: I know. We could be the first to plant a flag on Mars.
We could be the first to watch Mars Attacks on Mars.
We could be the first to say "Good lord, what on Mars are you talking about?"

Amy: We could also be the first people to procreate on Mars.
Sheldon: You just can't keep it in your space pants, can you?

Amy: Think about it. If we had a family there, our kids would be martians.
Sheldon: They would, wouldn't they? We could give them cool martian names. We could teach them about martian history, like who planted those flags or where'd that copy of Mars Attacks come from.

Sheldon: Hi little guy. How'd you like to come home with us? You'll be living with me, because we don't live in the same house.
Amy: But that's not your fault. Like you, we're taking it ridiculously slow. You'll stay with me when he's away for Comic-Con or with work.
Sheldon: Or if they accept daddy's application to live on Mars.

Amy: You applied for a mission to be a colonist on another planet and couldn't be bothered to tell me?
Sheldon: Would you have approved?
Amy: Of course not.
Sheldon: Well, based on your reaction, it looks like I made the right choice. Isn't that right, Giuseppe.

Sheldon: Do you want to say it?
Amy: Let's say it together.
Sheldon and Amy: We're getting a turtle!

Raj: So, where's your roommate tonight?
Emily: Well, I thought it was a little unfair that she's always here and you never get a chance to stay over, so I killed her.
Raj: Remember our agreement. You can joke about killing people, but you have to say "just kidding".

Raj: What are you doing?
Howard: Just playing video games while Bernie does the taxes.
Raj: What are you a little kid? Is she gonna cut your dinner in to little pieces, too?
Howard: She doesn't have to. I filled up on Jelly Beans.

Amy: Are you asking me to go to Mars with you?
Sheldon: I am. If I'm going to a barren, lifeless environment, where the chances of survival are slim to none, I want you there with me.

Leonard: I was unstoppable. I was on fire. It was like my mind and my body were totally connected, like athletes must feel when they're in the zone.
Penny: Again, it was miniature golf.
Leonard: Admit it, you're a little turned on.
Penny: You can't be this proud.
Leonard: Why not?
Penny: Because I beat you.

Leonard: Congratulations. Who would've thought you two would be the first in our group to start a family.

Sheldon: Oh dear lord. Oh dear lord.
Amy: It's okay. We made it. We're fine.
Sheldon: That was a lot of puppies.

Leonard: I got you something for Valentine's Day and I was too embarrassed to give it to you.
Penny: Why?
Leonard: Because I got it at the dirty store.
Penny: You went to the dirty store without me?
Leonard: In sun glasses and a hat after I parked two blocks away.

Raj: Oh no, oh no, oh God, no.
Howard: You know what? You sound busy. I'm going to let you go.