Howard: Ow. Damn, paper cut. Nothing worse than a paper cut.
Raj: Well, obviously you don't remember your circumcision.

Leonard: Okay, I know what'll cheer you up, let's play one of your driving games.
Sheldon: All right. This game is called Traitors. I will name three historical figures, you put them in order of the heinousness of their betrayal. Benedict Arnold, Judas, Dr. Leonard Hofstadter.
Leonard: You really think I belong with Benedict Arnold and Judas?
Sheldon: You're right. Judas had the decency to hang himself after what he did.

Leonard: Who's miserable and alone?
Raj: Me.
Leonard: Oh, I used to be like that. Then I got a girlfriend.
Sheldon: In pre-1976 terms, neener-neener.

Leonard: This tray contains clues as to what you and I are going to be doing on Valentine's Day.
Penny: Oh, wow. Okay. Let's see. We've got milk chocolate, Swiss cheese, fondue.
My lactose-intolerant boyfriend is going to eat all this, then I'm going to climb on his back and rocket to the moon?

Sheldon: I've been dreaming about going to the Large Hadron Collider since I was nine years old.
Leonard: Yeah, well, I've been dreaming about spending Valentine's Day with a girl since I was six.
Sheldon: Shame on you! That's no dream for a scientist.

Raj: He'll have a Shirley Temple.
Sheldon: And don't be chintzy with the Shirley.

Leonard: Sheldon took our order.
Penny: Sheldon doesn't work here.
Leonard: Well, honey, not to complain, but we were starting to think you didn't either.

Penny: Oh, there it is again. You think I'm stupid.
Leonard: No, there's a difference between being stupid and acting stupid.
Penny: Oh, yeah? Well, there's a difference between being a jerk and being an ass.
Leonard: No, there isn't. They're synonyms.

Sheldon: Wonderful security system if we're attacked by a school of tuna.
Howard: Don't worry, the net's going to be electrified. Picture her on the floor, spasming uncontrollably.
Sheldon: Better.

Howard: Now, inside, we've got motion detectors, infrared sensors, and cameras connected to a server running state-of-the-art facial recognition software.
Leonard: Where did you get all this stuff?
Howard: I got a buddy over at the Department of Defense.
Leonard: He just gave it to you?
Howard: I'm sure he would have if I had asked. Ironically, their security isn't all that good.

Sheldon: You know, the more I think about it, the mobster sauce couldn't possibly contain chunks of mobster.
Leonard: And why is that?
Sheldon: It was listed under seafood.
Leonard: What if they were mobsters who slept with the fishes?
Sheldon: Leonard, are we having a serious conversation or not?

Howard: Flesh-eating bacteria. And yet, I still want to kiss this woman, what does that tell you?
Penny: That you'd be willing to die a horrible death on the off-chance you'd get to second base?

Penny: I can't believe it. if I hadn't been working the dinner shift, I would've run right into the robbers.
Leonard: Hey, there's no reason for you to be scared.
Penny: I'm not scared. I would've gone all Nebraska on their asses.

Howard: Oh, come on. So you were the victim of a crime. That's part of life. When my great-grandfather first came to this country, he put all his hopes and dreams into this little butcher shop he ran on the Lower East Side of New York. You know what happened? Every customer who walked into that butcher shop and asked for a pound of liver, got ripped off. But, those people moved on, and so should you.

Sheldon: What if someone kidnaps me, forces me to record my voice, and then cuts off my thumb?
Leonard: I'll send them a basket of muffins.