Penny: You know, you go on and on about wanting things to stay the same, but you've changed a lot since I met you.
Sheldon: Oh, you are a mean drunk.

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

Sheldon: Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors.

Sheldon: Why are you crying?
Penny: Because I'm stupid.
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.

Amy: Oh. That's me. Hello? Yes, this is Dr. Fowler. I see. Okay, thank you. We won.
Penny: Congratulations!
Leonard: Oh, my God!
Sheldon: We did it.
Amy: I know. Can you believe it?
Sheldon: That's a good point. What if I'm dreaming? [Leonard slaps Sheldon] We won the Nobel Prize!

Sheldon: It's happening! [phone chimes] Unknown caller. It's got to be them.
Amy: Okay, put it on speaker.
Sheldon: Hello?
Amy: Hi.
Barry Kripke: Hello. This is Sweden calling. Is this Dr. Cooper and Dr. Fowler?
Sheldon: Yes.
Amy: Yeah.
Barry Kripke: Congratulations. It is my pleasure to inform you that you've won the Nobel Prize in being suckers!

Penny: So, I guess the only thing that actually stays the same is that things are always changing.
Sheldon: Interesting. So you're saying the inevitability of change might be a universal constant.
Penny: Well, there's a little more to it than that, but, yeah, sure.