Leonard: You know, if you're not gonna learn how to do this, they make some pretty good clip-ons.
Sheldon: Bruce Wayne doesn't wear a clip-on. Bruce Wayne doesn't make his roommate tie it for him.
Leonard: His name is Alfred, and, yes, he does.

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Ever since I saw Pretty in Pink, I've wanted to go to an American prom. But then I saw Carrie, and I did not want to go to an American prom. But then I saw Never Been Kissed, and I'm back on the prom bandwagon. This prom thing's been a real roller coaster.

Raj

Penny: Prom is silly anyways.
Bernadette: Easy for you to say; you probably went with the captain of the football team.
Penny: No. I just made out with him a little while his date was puking.

Penny: That, believe it or not, is my prom dress.
Bernadette: Wow, you still have it? I just assumed it was balled up in the corner of a barn somewhere.
Penny: What kind of teenager did you think I was?
Bernadette: Slutty.
Amy: Easy.
Penny: The word is "popular."

Howard: They're not dating. They're just two friends who went out to dinner.
Raj: And then went back to the home they share where they probably fell asleep in the matching pajamas she got them because they both just love penguins.
Howard: Hey, lots of people wear matching pajamas who aren't dating.
Raj: Like who?
Howard: Like you and your dog.
Leonard: Don't rule out the dating.

Leonard: Oh, hey, we ran into your mom at Benihana last night.
Howard: Uh, yeah, she loves that place. Every time they flip a shrimp in the air, she practically leaps out of her seat to catch it. That's why I don't take her to SeaWorld.

Penny: You locked them in your basement?!
Dr. Lorvis: Well, they're, they're not locked in. The door just sticks.
Penny: Okay, so how do they unstick it?
Dr. Lorvis: They'd need the key.

Raj: You think he bites?
Howard: Stick your hand in there and find out.
Raj: You fooled me with that goat at the petting zoo. You will not fool me again.

Penny: The real question is: What is he doing in your apartment?
Leonard: Oh, he was upset. So Sheldon invited him in for a hot beverage.
Penny: You were okay with that?
Leonard: No. I got upset! And Sheldon made me a hot beverage, too.

Amy: As a female scientist, I think what you do affects all of us.
Bernadette: And I think you don't like people expressing their sexuality because no one wants you to express yours.

Amy: I simply pointed out that they would never consider doing an article ranking male scientists on their sexuality, let alone showing them in various stages of undress.
Bernadette: Because no one wants to see Neil deGrasse Tyson in a wet T-shirt bent over the hood of a Porsche.

TBBT Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

Penny: I give up, he's impossible
Sheldon: I can't be impossible, I exist. I believe what you meant to say is, "I give up, he's improbable."