Sheldon: Well, people used to call me egghead 'cause there were eggs on my head. 'Cause they threw them at me.

Amy: Sheldon, if someone were gonna do something ethically murky on your behalf, would you rather know about it or not know about it to retain your innocence?
Sheldon: Well, now that I know there's a thing to know, I have to know. Can't help myself; I'm a fact addict.
Amy: That's not a real thing.
Sheldon: And that's a fact.

Amy: I mean, it's sweet that you want to help, but we don't want you compromising your integrity for us.
Sheldon: Wait, what- Really? I thought we were just worried about looking bad.
Amy: It could be both.
Sheldon: Okay. But I'm gonna go with my reason. Yours is too complicated.

Howard: Listen, I did something kind of stupid today.
Bernadette: Okay.
Howard: I went to The Cheesecake Factory to try to figure out who that waitress was.
Bernadette: Howie.
Howard: Don't worry, I didn't find out, because I realized I didn't even care. While I was there, I started asking myself, "Why does this mean anything to me?" And I guess the truth is it was all about my vanity. And why should I need to be validated by another woman liking me when the best woman in the world already loves me? And I just wanted you to know that. [chuckles]
Bernadette: The restaurant manager already called. You really creeped a lot of people out.
Howard: And I regret that. [chuckles] Because the only woman I want to creep out is the mother of my children.
Bernadette: Well, you're off to a good start.

Wil Wheaton: Hey, what are you guys doing here?
Amy: Oh, I, uh, think Sheldon might have left something.
Wil Wheaton: Oh, you mean, besides his lunch?

Bernadette: I dunno, I married for love and it turned out ... fine.
Penny: [silence] Oh, yeah, me, too.

Sheldon: Hello, Bernadette.
Bernadette: Wait, did you just walk into my house?
Sheldon: No, Howard let me in.
Bernadette: Where is he?
Sheldon: Oh, he got in his car and drove away.

Amy: Let me guess. This thing with Tam escalated, and now you're mad at Leonard and looking for a new best friend?
Sheldon: You know me so well. It's too bad you can't be my best friend.
Amy: I can be.
Sheldon: You can't be my wife and my best friend. Who would I complain about you to?

Anu: Come on.
Penny: There's really nothing to tell. Raj is so much fun to hang out with. He's like one of our girlfriends. And I mean that in a good way.
Bernadette: But also a bad way.

William Shatner: Hello.
Sheldon: Captain on the bridge! Captain on the bridge! You're William Shatner.
William Shatner: You can call me Bill.
Sheldon: Ooh, can I call you Captain?
William Shatner: No.
Sheldon: Please?
William Shatner: No.
Sheldon: [whispers] Please?
William Shatner: Sure.
Sheldon: And w-will you call me Science Officer Cooper?
William Shatner: This has got to stop.
Sheldon: I think you know how to make it stop.
William Shatner: Put her there, Science Officer Cooper.

Anu: Anything else?
Penny: No.
Bernadette: No.
Penny: I mean, he takes baths with his dog, but not in a weird way.
Bernadette: Or a normal way; they both wear swimsuits.

Penny: Never? Isn't that usually when you go to the gym?

Sheldon: Leonard, when are you leaving to pick your mother up from the airport?
Leonard: Uh, well, let's see, her plane gets in at 3:00, figure half hour to get her luggage, so never.

Penny: Well, people came, they ate, they vowed to never speak to each other again. I think it was a successful party.

Sheldon: Anyway, Tam stayed with her in Texas, and I had to move out here all by myself.
Amy: That must've been scary.
Sheldon: It was. I was lonely, and I thought I'd never make a friend again. And for a long time, I didn't.
Amy: But then you did. And great friends. If you think about it, if Tam had moved out here with you, who knows what your life would've been like.
[Montage of classic The Big Bang Theory moments with Tam as Sheldon's roomate]