Howard: What's this? (hand movement)
Sheldon:That's what you did. I assumed, as in a number of languages, that the gesture was part of the phrase.
Howard: Well, it's not.
Sheldon: Why am I supposed to know that? As the teacher, it's your obligation to separate your personal idiosyncrasies from the subject matter.

Sheldon: (Speaking Chinese to Leonard).
Howard: You just called Leonard a syphillitic donkey.
Sheldon: My apologies, Leonard. I'm only as good as my teacher.

Sheldon: (In Mandarin) Show me your mucus. Your mucus!
Chen: (Mandarin) Blow your own nose and go away!
Sheldon: (Mandarin) This is not a tangerine bicycle. Show me your mucus!
Chen: Crazy man. Call the police.
Sheldon: (Mandarin) No, don't call the library. Show me your mucus.

Leonard: Before you say anything, have you heard of Schrodinger's cat?
Penny: Actually, I've heard far too much about Schrodinger's cat.
Leonard: Good.
*Leonard and Penny kiss*
Penny: All right, the cat's alive. Let's go to dinner.

Penny: Drop dead, you stupid, self-centered bastard.

Leonard: What about if you went out with me?
Penny: Are you asking me out?
Leonard: Um, yes, I am, asking you out.
Penny: Wow.
Leonard: I was just going off your comment about the nice guy...
Penny: No, I know, I got that. Yeah, totally.
Leonard: ...thing and honestly, it's no big deal.
Penny: Yes.
Leonard: Yes what?
Penny: Yes, I will go out with you.
Leonard: Really?
Penny: Yeah. Why not, I mean, what do I have to lose?
Leonard: Yeah. That's the spirit.

Sheldon: (Practising speaking Mandarin) Show me your citrus peels.
Penny: Sheldon?
*Sheldon freaks out in Chinese.*
Penny: I'm sorry. Look, do you have a second?
Sheldon: A second what? Pair of underwear?

Penny: (crying) How could he do that?
Leonard: Oh, you did throw an 80-gig iPod-- Yeah, no, how could he do that?

Sheldon: Mmm. (In Mandarin) Your monkey sleeps inside me.

Sheldon: Howard, I'm gonna need another mandarin lesson, I obviously didn't make my point with those people.
Howard: For God's sake, Sheldon, if you don't like the tangerine chicken, don't order the tangerine chicken.
Sheldon: I like tangerine chicken, I'm just not getting tangerine chicken.

Penny: Hey, jerk face, you forgot your iPod.

Leonard: Why are you learning Chinese?
Sheldon: I believe the Szechuan Palace has been passing off orange chicken as tangerine chicken, and I intend to confront them.
Leonard: If I were you, I'd be more concerned about what they're passing off as chicken.

Sheldon: (In Mandarin) Many oxen are in my bed! Many, many oxen!
*Chen flings his hands at Sheldon*
Sheldon: (Mandarin) Oy Vey.

Raj: (Reading Game Card) Enslaved by warlocks, stay here till you roll 2,4,or --
Leonard: She was mad at him, she was done with him, the relationship was broken beyond repair and I walked over there and I fixed it.
Howard: Boy that story gets better every time you hear it.

Raj: Incredible. You managed to screw up the screw up.