Leonard: The guy who seems like an emotionless robot ... is you, but your relationship with Amy is causing you to transform into a red-blooded man with sexual desires.
Sheldon: That is literally the stupidest thing I've heard.

Leonard: Come on, Sheldon. It will be fun.
Sheldon: That's what you said about the Green Lantern movie. You were 114 minutes of wrong.

Leonard: What are you doing?
Amy: We're playing doctor. Star Trek style.
Sheldon: I'm in hell, Leonard. Don't stop.

Sheldon: Can I ask you a question about women?
Leonard: I got you that book last year, wasn't everything in there?

Leonard: I'm sorry! I did, I crossed a line I didn't mean to.
Penny: Who says something like that right in the middle of sex?
Leonard: I don't know, it just came out! People say weird things during sex all the time.
Penny: Okay, well they sure as hell don't say that.
Leonard: It was heat of the moment.
Penny: No, the heat of the moment is "Oh yeah, just like that." Not "will you marry me?"
Leonard: I'm sorry, just-just give me another chance.
Penny: Why, so you can crawl under the covers and go, "Hey, baby, wanna go look for houses in neighborhoods with good schools?"

And, I promise after waiting four months fast is what you are gonna get.

Penny: Why should I worry?
Leonard: Well, I don't know. It's a bachelor party, there could be strippers. Wouldn't that make you a little jealous?
Penny: Come on, Leonard, it's you. What's gonna happen? I mean, even if there was a stripper, all you'd do is avoid eye- contact and offer to help her kid with his homework.

Leonard: Raj, you're our group historian. Has Sheldon ever begged before?
Raj: Three times. He begged the Fox network not to cancel 'Firefly.' He begged the TNT network to cancel 'Babylon 5.' And when he got food poisoning at the Rose Bowl Parade, he begged a deity he doesn't believe in to end his life quickly.

That's amazing. You'll be like his pit crew.

Penny: What is the truth?
Sheldon: My Mr. Spock doll came to me in a dream and forced me to open it. And when the toy broke I switched it for yours. Later, he encouraged me to do the right thing and I defied him. And then I was attacked by a Gorn.
Leonard: Okay, that I believe.

Leonard: Once you open the box, it loses it's value.
Penny: Yeah, yeah. My mom gave me the same lecture about my virginity. I gotta tell you, it was a lot more fun taking it out and playing with it.

Leonard: You went to the comic book store by yourself?
Penny: Yeah. It was fun. I walked in and two different guys got asthma attacks. Felt pretty good.

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?