Leonard: Ladies do love a guy dressed like a kitchen garbage bag.

Leonard: Do you know what a disaster this is?
Howard: You mean because this room isn't supposed to have dust in it, and we just let in a flying crap machine.

Bernadette: So your evil plan here is to buy your girlfriend a present?
Sheldon: That's right. So stay on my good side, or maybe I'll get you a little something, too.

Penny: So, if you don't mind me asking, do you think you might start dating again?
Dr. Koothrappali: It's much too soon for that. Why, do you know someone?
Penny: No, but if things don't work out with me and Leonard, I'll call you. Wait, how much do you talk about Star Trek?

Penny: It's kinda boring. Although it did get exciting for a minute when Amy inhaled a wool ball.

Raj: If you people think this is better than Tom Hanks-Giving, you're all crazy.

Penny: There's got to be something fun we can do that the guys will hate.
Leonard: Hang on, why do we have to hate it?
Penny: Three words: Doctor Who convention.

Sheldon: He were go, compromising again. We really are the best.

Penny: Have fun.
Sheldon: Oh, I will. Nothing more fun than a paradigm shifting evening of science.
Penny: (To Leonard) And you thought it was soaping me up in the shower.

Sheldon: I'm not going to work today. And would you like to know why?
Leonard: You're upset because you spent the whole night working on dark matter and didn't make a break through, and now you're worried you made a huge mistake switching fields, and you're gonna sit around and sulk all day.
Sheldon: Like a big old baby.

Sheldon: You sounded in distress. I was worried something unpleasant was happening to you, like a murder or spontaneous coitus with Leonard.

Sheldon: I'd like to ask you all to do something for me. Keep me on my toes. Just throw me off my game. Essentially, go out of your way to make my life miserable.
Howard: Hold on. What's in it for us?
Sheldon: Well, I suppose-
Howard: Okay, we'll do it!

Penny: What exactly do you think goes on here?
Sheldon: Well, conversations that you wouldn't be comfortable having in front of the opposite sex. You know, who has the best cervix. Which sanitary napkin is all the rage right now. Men's buttocks and how you want to pat and squeeze them.

Leonard: What is going on?
Sheldon: Oh, I need to keep my anxiety at the right level. So I'm using Darth Vader, the Joker and Godzilla's roar to keep me in that sweet spot. I tried including Taylor Swift in the mix, but turns out I love her.

Howard: Okay, so it's one vote Emily, one vote Cinnamon. Penny, you're the tie breaker.
Penny: Say the quote again.
Howard: "It's just so perfect that we're both Libras."
Penny: Wow, this is just so hard. I'm gonna say Cinnamon.
Howard: Yes!
Raj: Come on!