Sheldon: Now, where were we? Oh, yes. Does anyone have any wood?
Raj and Howard: [Both snickering]
Sheldon: Oh, come on. I just want wood. Why are you making it so hard?

Yes, she's pushy, and yes, he's whipped, but that's not the expression

Wolowitz [to Raj]

Howard: So, I got the craziest email this morning.
Raj: I hate to burst your bubble, dude, but those penile enlargement pills do not work.
Howard: Believe me I know.

Can I get you something? A feminine hygiene product or a bowel-regulating yogurt?

Sheldon

Leonard: What am I doing in your spam folder?
Sheldon: I put you there after you forwarded me a picture of a cat playing the piano entitled, "this is funny."

Amy: I'm dating Sheldon Cooper
Penny: Yes, on purpose.
Amy: He's handsome, he's lanky, he's brilliant and his skin has the pale, waxy quality.
Penny: Well, sickly is the new sexy.

Penny: Okay, sex is not what makes you a grown-up.
Bernadette: Yeah, or you'd be the oldest one here.
Penny: Really? Is that how you talk to your mother?

Wil Wheaton: You do realize I'm doing this for free, right?
Amy: Yes and so far we're still not getting our money's worth.

Penny: We're keeping things, you know, homeostasis.
Amy: It's so cute when she tries.

Amy, I excel at many things, but getting over you wasn't one of them.

Sheldon

Leonard [referring to him and Penny]: Our babies would be smart and beautiful.
Sheldon: Not to mention imaginary

Howard: Creepy chummy, like you and your dog.
Raj: She feeds him out of her own mouth?
Howard: I mean, he calls her Debbie, she calls him Stewie and they're all giggly around each other. And believe me, when food goes in that mouth, it does not come out.

TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?