Sheldon: Hold on I believe that social convention dictate you not arrive empty-handed. Would you like to bring some Cylon toast?
Leonard: Yeah, no, I'm trying to fit in, not get laughed at.
Sheldon: What's funny about Cylon toast?

Howard: I brought you a little gift. New kite.
Raj: The kite you made me lose was an authentic Patang, an Indian fighting kite that my brother sent to me from New Delhi. It took me a day to put together and two days to paint. This is Hello Kitty.
Howard: Yeah, but it comes with a little coin purse. Does a Patang?

Leonard: Go! Go! Go! Go, go, go, go! Yes! Are you people watching this? Is this amazing or what?
Penny: Sweetie, that's a highlight from the '98 championship game.
Leonard: Oh. Did not know that.
Penny: How much beer have you had?
Leonard: None. Why?
Penny: Oh. I was just kind of hoping you were drunk. Now we're back live.
Leonard: Okay, yeah. I can see the difference.

Penny: Sheldon, come in.
Sheldon: Thank you. I'd like to make a sandwich, but I'm out of bread.
Penny: There's some in the fridge.
Sheldon: You shouldn't keep your bread in the refrigerator. Staleness is caused by crystallization of the starch molecules, which occurs faster at cool temperatures.
Penny: On Earth, we say thank you.

Sheldon: So Leonard, how goes the mimesis?
Leonard: Mimesis?
Sheldon: You know. Mimesis. An action in which the mimic takes on the properties of a specific object or organism. Mimesis.
Leonard: What the hell are you talking about?
Sheldon: I'm attempting to communicate with you without my meaning becoming apparent to those around you. Let me try again. Have the indigenous fauna accepted you as one of their own? Nudge, nudge, wink, wink.

Leonard: How about that, Einstein was wrong.
Penny: What?
Leonard: Approaching the speed of light doesn't slow down time, approaching them does.

Wil Wheaton: Did that guy just say "Revenge is a dish best served cold" to me in Klingon?

Wil Wheaton: Game over, Moonpie.

Wolowitz: Puppies, how do you stand on puppies?
Bernadette: A puppy once bit my face!
Wolowitz: Of course it did.

Rajesh: What are you waiting for?! Kill Wil Wheaton! From hell's heart, stab at him!

Wil Wheaton: What's wrong with him?
Stuart: Everybody has a different theory.

Bernadette: My mother wouldn't let me ride a bicycle because she was afraid I might hit a bump and lose my virginity.

Sheldon: Die, Wil Wheaton, die!

Leonard: What am I supposed to ask her? "Hey Penny, you got any friends that you never want to talk to again?"

Sheldon: From Hell's heart, I stab at thee!