Sheldon: Okay, here it comes. You tried to take care of me when I was sick, and I was mean to you. There's no excuse for that. And I'm truly sorry.
Leonard: Thank you. I appreciate that.
Sheldon: I want you to know that that is sincere. I do feel bad. I'm not just saying it to be included on your trip.
Leonard: Appreciate that, too.
Sheldon: Terrific. Now all that's left is for you to invite me to come. Me to ask, "Are you sure?" You to say, "Absolutely." And then me to bring it home with, "How could I say no to that face?"
Leonard: You're still not coming.
Sheldon: What? But I apologized and I meant it. I know that we don't play this game very often, but you're doing it wrong.
Leonard: Sheldon, I accept your apology, but you upset a lot of people while you were sick. I'm not in a position to just say you can come.
Sheldon: Well, all right. What if I apologize to all of them?
Leonard: Fine, if you apologize to everyone, they all say it's okay, then yes, you can come.
Sheldon: Challenge accepted! Sounds like it's time for the Sheldon Cooper Apology Tour.
Leonard: Well, I hope it's as much fun as the Sheldon Cooper Spell-Checks Local Menus Tour.
Sheldon: My goodness! Do you remember "comes with apsparagus"?

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: Hi, Sheldon.
Sheldon: Hello.
Amy: Are you feeling any better?
Sheldon: Physically, yes, but I'm upset because everyone's mad at me for no good reason.
Amy: Why don't you tell me what happened, and in a gentle, loving way, I'll explain to you why you're wrong.

Sheldon: Good. Then I'll be leaving now.
Emily: Oh, it's okay, Sheldon. Come with us.
Sheldon: Oh, that's very kind of you. But I'm sure you'll all have a better time without me. Let's go, Stuart.
Stuart: But I want to stay.
Sheldon: Stuart, now!

Sheldon: Raj, you were being a good friend, and my illness was no excuse for my behavior. I hope that you can accept my apology.
Raj: Of course I do.
Sheldon: And, Emily, I'm sorry for saying dermatologists aren't real doctors. And I'm sure you're tired of hearing that.
Emily: Do you honestly think I hear that a lot?
Sheldon: Well, I would imagine when your job is popping zits and squirting Botox into old lady faces-
Raj: Okay! Okay, the point is that we accept your apology.
Emily: Uh, maybe you do. He just insulted me again.
Raj: Yeah, but he doesn't mean it.
Emily: Why are you defending him?
Sheldon: I believe I can answer that. Uh, like me, Raj is demonstrating empathy.
Now, why don't you accept my apology, receive your free T-shirt, uh-- I hope extra small is okay. For some reason Wolowitz took a medium.