Howard: *Noticing Raj peeking through someone's window using the telescope* Oh, Raj, no. Billions of dollars have gone into inventing the Internet and filling it with pictures of naked women, so we don't have to peep through windows.

Sheldon: That seems like an awful lot of trouble to go through for intercourse. Don't you have access to women who will do it for money?

Raj: I like the new look.
Howard: Thanks. I call it the Clooney.
Raj: I call it the Mario and Luigi but whatever.

Leonard: She didn't dump me. We were just in different places in the relationship.
Sheldon: I fail to see how a relationship can have the qualities of a geographical location.
Wolowitz: It's very simple. Leonard was living in a little town called "Please don't leave me", while Penny had just moved to the island of "Bye-bye!"

Sheldon: Given that Saint Valentine was a 3rd century Roman priest who was stoned and beheaded, wouldn't a more appropriate celebration of the evening be taking one's steady gal to witness a brutal murder?

Penny: Look, can we just forget about this extra stuff and can you just tell me what Leonard does?
Sheldon: Alright. Leonard is attempting to learn why subatomic particles move the way they do.
Penny: Really? That's it? Well, that doesn't sound so complicated.
Sheldon: It's not. That's why Leonard does it.

*Raj comes in playing Darth Vader's background music from Star Wars*
Leonard: Would you please turn your shirt off?
Raj: What? I'm giving myself dramatic entrance music. People will know I'm awesome and to be feared.
Wolowitz: Right. There's nothing more awesome and frightening than a man who's got music blasting from between his nipples.

Sheldon: Where exactly does the half-sandwich come from? Are you giving me half of someone else's sandwich, or do I have to wait for someone in the restaurant to order the other half?

Penny: Hey Sheldon, whattcha got there a new comic book?
Sheldon: Old comic book. I just got it from the safe deposit box.
Penny: What do you have a safe deposit box for?
Sheldon: Old comic books.

Sheldon: One ring to rule them all.
Rajesh: One ring to find them.
Wolowitz: One ring to bring them all.
Leonard: And in the darkness bind them.
Rajesh: Holy crap are we nerdy!

Leonard: How can I go out with a woman who believes in psychics?
Howard: Hey, I once dated a girl who believed she was abducted by aliens.
Leonard: And that didn't bother you?
Howard: Au contraire. It meant that she was gullible and open to a little probing.

Sheldon: Now to the astronomers in the audience, get ready to see the dark side of the moon. Now here's Uranus!

Leonard: What's going on?
Sheldon: We scored. I'm the wingman.

Sheldon: Oh, Ubuntu. You're my favorite Linux-based operating system.

Dr. Plimpton: Tonight, you are the delivery man, you brought soup, and uh-oh! Raj and I don't have enough money to pay you! So we'll have to come to some other kind of arrangement?
Howard: Beg your pardon?
Dr. Plimpton: You two figure out the details; I'm gonna change into something I don't mind getting ripped off my milky flesh! (goes off to change)
Howard: What the frack?
Raj: Go away. She wants New Delhi, not kosher deli. Besides, you have a girlfriend.
Howard: Yeah, we broke up weeks ago.
Raj: What? Why didn't you say anything?
Howard: I was waiting for the right time; this is a right time.