Leonard: There you go, Pad Thai, no peanuts.
Howard: But does it have peanut oil?
Leonard: Uh, I'm not sure. Everyone keep an eye on Howard in case he starts to swell up.
Sheldon: Since it's not bee season, you can have my epinephrine.

Penny: Hey Raj! (silence) Still not talking to me, huh?
Sheldon: Don't take it personally. It's his pathology. He can't talk to women.
Howard: He can't talk to attractive women, or in your case a cheesecakescented Goddess!

Sheldon: You do understand that our efforts here will in no way increase the odds of you having sexual congress with this woman?
Leonard: Men do things for women without expecting sex.
Sheldon: Yeah, those are men who just had sex.
Leonard: I'm doing this to be a good neighbor. In any case, there's no way it could lower the odds.

Sheldon: You might want to speak in a lower register.
Leonard: What?
Sheldon: Evolution has made women sensitive to high pitched noises while they sleep, so that they'll be roused by a crying baby. If you want to avoid waking her, speak in a lower register.
Leonard: That's ridiculous. (Penny snores.)
Sheldon: No, (lowering his voice) that's ridiculous.
Leonard: (In a lower register) Fine. I accept your premise, now please let's go.

Howard: Haven't you ever been told how beautiful you are in flawless Russian?
Penny: No, I haven't.
Howard: Get used to it.
Penny: Yeah, I probably won't.