Raj: You know, many people believe home births are better because the mother's in a warm, comfortable environment where she can be nurtured by loved ones.
Sheldon: And turn the bedroom floor into an amniotic slip 'n slide.

Penny: You guys just got back together. You might not want to ditch her on her birthday.
Leonard: I think Penny has a point. You can see it another day.
Sheldon: But someone might spoil the movie. No one can spoil Amy's birthday for me. Surprise, she's even older. Who saw that coming?
Penny: Aww, that's nice. Put that on her cake.

Sheldon: Excuse me. Wolverine Origin, mini series issue two, page 22, retractable bone claws. You know, if you three spent less time thinking about sex and more time concentrating on comic books, we would have much less of these embarrassing moments.

Sheldon: What is the best number? By the way, there's only one correct answer.
Raj: 5,318,008?
Sheldon: Wrong. The best number is 73. [short silence] You're probably wondering why.
Leonard & Howard: No, no, we're good.
Sheldon: 73 is the 21st prime number, its mirror 37 is the 12th and its mirror 21 is the product of multiplying, hang on to your hats, 7 and 3. Did I lie?
Leonard: We get it. 73 is the Chuck Norris of numbers.
Sheldon: Chuck Norris wishes. In binary, 73 is a palindrome, 1001001, which backwards is 1001001, exactly the same. All Chuck Norris gets you backwards is Sirron Kcuhc.
Raj: Just for the record, when you enter 5,318,008 in a calculator, upside down it spells boobies.

Sheldon: Interesting! So it went beyond the mere fact of coitus to a blow by blow account, as it were.
Amy: Pun intended?
Sheldon: I'm sorry, what pun?

Sheldon: This is Leonard. He's your best friend in the world.
Leonard: All right, just stop. This is ridiculous.
Sheldon: Sometimes he gets cranky, but you can trust him with your life. And he does more things for you than I can even begin to list.
Leonard: Thank you.

Sheldon: Don't worry. I will remain the same down to earth, humble Joe I've always been.
Leonard: Good to know.
Sheldon: Now give me that cookie, I discovered an element.

Sheldon: I got a splinter.
Amy: What do you want me to do about it?
Sheldon: Relationship Agreement - Section 4: Boo-boos and Ouchies. You have to take care of it.
Amy: I should've gotten a lawyer.

Penny: I finally convinced the restaurant to give me a bar-tending shift, so I need to practice mixing drinks.
Leonard: That's Great! The key to acquiring proficiency in any task is repetition.
Sheldon: With certain obvious exceptions. ... Suicide, for example.

Sheldon: Who's Nowitzki?
Ramona: I'm Nowitzki.
Sheldon: Oh, so you want me to share credit with you?
Ramona: Uh huh.
Sheldon: Get out!

Amy: Did you hold the baby?
Sheldon: I did.
Amy: And how did it make you feel?
Sheldon: Looking into the blank, innocent eyes of a creature that couldn't begin to comprehend anything I was saying ... basically another day at the office.

Amy: You're making me worry. What's going on?
Sheldon: What's going is we're about to go to a prom and there's a great deal of pressure on young couples like us to engage in what Mr. Bob Eubanks called "makin' whoopee".

Sheldon: Um, Penny, that's where I sit.
Penny: So, sit next to me.
Sheldon: No, I sit there.
Penny: What's the difference?
Sheldon: "What's the difference"?
Leonard: Here we go.
Sheldon: In the winter, that seat is close enough to the radiator to remain warm, and yet not so close as to cause perspiration. In the summer, it's directly in the path of a cross breeze created by open windows, there and there. It faces the television at an angle that is neither direct, thus discouraging conversation, nor so far wide to create a parallax distortion. I could go on, but I think I've made my point.

Penny: Strap on a pair and go talk to Amy.
Sheldon: Strap on a pair of what? ...Skates?
Penny: Oh, you are so not the guy.

Sheldon: Well, my new friend's name was Eric, Amy's lips tasted like the brownie we had for dessert, and the banjo-playing conductor was missing a finger but made up for it with his can-do attitude.