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.

Sheldon: Hold on, Doctor. Leonard, where are your social skills?This man is clearly upset. We should invite him in for a hot beverage.
Leonard: He tried to score with Penny.
Sheldon: So have these two, and they're having dinner with us.

You know, maybe if fashion magazines had female scientists in them, I would've become a theoretical physicist. Stop smirking at each other.

Penny

Okay, what's the big deal? Look, if it helps me make a sale with a physician, I don't think it hurts to flirt a little. I mean, laugh at their joke, touch their arm, maybe crank up the AC in the car beforehand, you know, to wake up the girls.

Penny

Amy: Bernadette is a successful microbiologist. She should be celebrated for her achievements, not her looks. I mean, what kind of message does that send?
Penny: I think the message is -- "Check out the rack on that scientist."

Raj: I was trying to help you! And at the first sign of trouble you ran away, leaving me to fend off a family of rats! You're a completely selfish human being and a... and a physical and a moral coward!
Sheldon: His statements of the obvious continue to annoy.

TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.