Amy: (About Sheldon) Why do I even try?
Bernadette: I'm going to fix this right now.
Howard: Okay, but just make it look like an accident.

Sheldon: Careful, Amy. The friend of the enemy's girlfriend is my enemy.
Amy: Really?
Sheldon: You're either with me or against me.
Amy: You wanna take the bus to work?
Sheldon: Maybe there's a third option.

Sheldon: I made a new friend who likes trains as much as I do, I kissed Amy on the lips, and the conductor played his banjo for me.

Sheldon: What are the sleeping arrangements? We've only been dating for three years. If we were to share a room people might talk.

Raj: I don't have (Valentine's) plans, which is why I booked time on the big telescope that night.
Amy: An evening looking at the stars, that's still kinda romantic.
Raj: Except I'd be alone.
Amy: I'm trying to put lipstick on a pig here. Work with me.

Penny: You know if we did a shot every time they said something embarassing, this would be one hell of a drinking game.
Amy: Little early for alcohol, isn't it?
Sheldon: (On the radio) You know, I don't just say smart things about science, I also yodel. *Yodelling*
Amy: I'll get the vodka.

Raj: Have you heard from Howard?
Bernadette: I did. His talk at NASA went great.
Penny: Sheldon didn't heckle him?
Bernadette: No. In fact, he was so well behaved Howard bought him a Buzz Aldrin bobblehead and astronaut ice cream.

Leonard: I get that you feel bad about all the attention, but still what you did is amazing. We're really proud of you.
Amy: I'm not.
Sheldon: You're not?
Amy: Sheldon, I've been thinking about it and you're right. You don't deserve any credit. All you did was misread some numbers on a table. A very easy table, too. Honestly, I'm embarrassed for you.
Sheldon: That's the most romantic thing I've ever heard.
Penny: Damn it, everyone's better at this than me.
Sheldon: Congratulations, Dr. Fowler. You just made the fort.

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.

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.

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.

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.

Leonard: Hang on, hang on. Are all those things equal to you?
Sheldon: Hmm, it never occurred to me to pick a favorite.
Leonard: Give it a go.
Sheldon: I can't answer that without collecting additional data.
Leonard: "Additional data", you dog!
Sheldon: I'm not sure how listening to other nine-fingered banjo players makes me a dog, but all right.

Raj: It wouldn't be Thanksgiving without an Indian providing the food.

Amy: It actually sounds like he's doing pretty well.
Penny: I really think this is going to be for the best.
Leonard: Me too. And he was able to take a sabbatical -
*Amy starts hitting Leonard with a pillow*
Amy: How could you let him go!?