Leonard: I regret not saying "yes"when you asked me to marry you.
Penny: Well, it just wasn't the right time.
Leonard: Yeah.
Penny: And this is also not the right time. Do not propose.
Leonard: What?
Penny: I know that face. That's your propose face.

Penny: There's no reason why I shouldn't be the best bisexual go-go dancer slowly transforming into a killer gorilla
anyone's ever seen.
Leonard: I don't know. The bisexual gorilla go-go dancer in Schindler's List is tough to beat.
Sheldon: Ah, very good. Because a gorilla go-go dancer
of any sexual preference would be out of place in a film about the Holocaust.
Leonard: It only gets funnier when you explain it, Sheldon.
Sheldon: I know.

Sheldon: When Darth Vader struck down Obi-Wan, did Luke cry like a baby and go to his funeral?
Penny: No. He blew up the Death Star. Why do I know this?!

Every family in America has a relative holed up in a garage somewhere huffing paint thinner

Penny: Oh, that's great. You're gonna be an uncle. Uncle Sheldon.
Sheldon: No. I'll be Uncle Dr. Cooper.

Leonard: Penny, say hello to Leo.
Penny: Hi, Leo. How are you feeling?
"Leo": Have you ever woken up in a flea-bag motel, covered in your own vomit, next to a transsexual prostitute?
Penny: No.
"Leo": Then don't ask me how I'm feeling.

Leonard: Penny and I have some big news.
Penny: We're engaged!
Raj: And I thought me having sex with Emily was gonna be the big news.

Leonard: I know his password, so I can track his phone.
Penny: You do that?
Leonard: Not always, but ever since he wandered off at the swap meet chasing a balloon, I get worried.
Penny: He can take care of himself. Look, we went over stranger danger and gave him that whistle.

Penny: He'll be okay. You taught him well, Padawan.
Sheldon: Good Lord! Padawan's the student,
not the teacher.
Penny: Seriously, let him go.

Sheldon [knocking on Penny's door]: Penny, Penny, Penny...
[Penny opens the door]
Sheldon: Good morning.
Penny: Do you have any idea what time it is?
Sheldon: Of course I do, my watch is linked to the atomic clock in Boulder, Colorado. It's accurate to one-tenth of a second, but as I'm saying this it occurs to me once again your question may have been rhetorical

You didn't get your part cut. You didn't get your part cut. Yep. A bunch of old guys rockinig out in a band, all with erectile dysfunction, you didn't get your part cut!"

Leonard: Can we talk?
Penny: We can, but the part of "Penny" might get cut.

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?