Penny: This is kind of creepy.
Sheldon: We're not supposed to talk during this part.
Penny: Sorry.
Sheldon: This is kind of creepy.

Penny: Do you want to stop? I know you have trouble with eye contact.
Sheldon: Well, you have a brown fleck in your right iris that looks like a Formula 1 race car, so I'm just concentrating on that. Plus it's easier around people I'm comfortable with.
Penny: Oh, sweetie, I'm comfortable around you, too.
Sheldon: Of course you are. I'm warm and soothing. I'm like a human bowl of tomato soup.

Penny: I meant more like a little brother.
Sheldon: Oh. Well, I suppose I do think of you like a sister. And sometimes a mother.
Penny: It's getting creepy again.

Penny: Just thinking about the day I met you and Leonard.
Sheldon: It was a Monday afternoon. You joined us for Indian food.
Penny: Can you believe it's been eight years?
Sheldon: And you're still eating our food.

Sheldon: I think it's safe to say you're not in love with me and I'm not in love with you. And psychology has once again proved itself the doofus of the sciences.

Bernadette: You better find my husband's mother, 'cause one way or another we're walking out of this airport with a dead woman.

Leonard: We spent $200 on six minutes of fun.
Raj: It's like when we bought that remote-controlled helicopter and it just flew away.

Penny: If you were to die this evening with no opportunity to communicate with anyone, what would you most regret not having told someone?
Sheldon: So it would be today? Huh. Well, I suppose there's something satisfying about dying on my birthday.
Penny: Today's your birthday?
Sheldon: Yes.
Penny: Well that's always been a secret. Not even Amy knows.
Sheldon: Well, I don't enjoy presents. And the thought of people jumping out and yelling surprise fills me with more dread than the words "George Lucas Director's Cut.

Penny: That's so funny. I never would have pegged you for a Pisces.
Sheldon: You're making it difficult to love you right now.

Howard: I'm sorry I didn't take you to the airport. I just want you to know I'll never forgive myself for being so selfish. And I promise to keep you close for the rest of my life.
Bernadette: Oh, no, that thing's gonna end up in my bedroom.

Penny: Wow, I just felt this wave of emotion for you.
Sheldon: You sure it's not too much bible juice?
Penny: And the wave is gone.

Raj: Okay, let's hope one of the clues is written on a pair of clean underwear.

Howard: Your entire job is to find lost luggage and you've narrowed down the location of my mother to the planet Earth?

Sheldon: If you could wake up tomorrow having gained any one quality or ability, what would it be?
Penny: Well, not to steal from the bible, but turning water into wine sounds pretty good.

Sheldon: You may not be as academically inclined as are we. Yes, that's how you say it. But you possess an intelligence I envy, which leads me to my answer. I would choose the ability to read people's minds.