Sheldon: (to Leonard, who has decided to give up on Penny) Well, at least now you can retrieve the black box from the twisted, smoldering wreckage that was once your fantasy of dating her and analyze the data so you don't crash into Geek Mountain again.

Sheldon: Score 1 for liquor and poor judgement.

Sheldon: I do feel obligated to point out to you that she did not reject you, you did not ask her out.
Leonard: You're right. I didn't ask her out. I should ask her out.
Sheldon: No! No that was not my point. My point was don't buy a cat.
Leonard: No, but you're right, I should march over there and ask her out.
Sheldon: Oh, goody! We're getting a cat.

Raj: He's selling the Sword of Azeroth on eBay.
Leonard: You betrayed us for money? Who are you?
Sheldon: I'm a rogue Night Elf. Don't you people read character descriptions?

Sheldon: Penny for your thoughts?

Sheldon: Is the sex starting now?
Leonard: I'm having a panic attack.
Sheldon: Oh, okay. Well then, calm down!

Leonard: Raj, no, it's a trap. They're flanking us!
Raj: Oooh, he's got me.
Howard: Sheldon, he's got Raj. Use your sleep spell. Sheldon! Sheldon!
Sheldon: I've got the Sword of Azeroth!
Leonard: Forget the sword, Sheldon, help Raj.
Sheldon: There is no more Sheldon. I am the Swordmaster!

Leonard: Well, I'm done with Penny. I'm going to be more realistic and go after someone my own speed.
Raj: Like who?
Leonard: I don't know. Olivia Geiger?
Sheldon: The dietitian at the cafeteria with the limp and the lazy eye?
Leonard: Yeah.
Sheldon: Well, I don't think you have a shot there.

Sheldon: I have noticed that Lesley Winkle recently started shaving her legs. Now, given that winter is coming one can only assume that she is signaling sexual availability.

Leonard: God, that's a good song.
Sheldon: If you're compiling a mix CD for a double suicide.

Leonard: How do I look?
Sheldon: Could you be more specific?
Leonard: Can you tell I'm perspiring a little?
Sheldon: No. The dark crescent-shaped patterns under your arms conceal it nicely.

Sheldon: What time is your date?
Leonard: Six thirty.
Sheldon: Perfect, that gives you two hours and fifteen minutes for that dense molecular cloud of Aramis to dissipate.
Leonard: Is it too much?
Sheldon: Not if you're a rugby team.

Sheldon: Of course, there's the other possibility that this date kicks off a rather unpleasant six months of the two of you passing awkwardly in the hall until one of you breaks down and moves to another zip code.
Leonard: You could have stopped at "it could go well."
Sheldon: If I could've, I would've.

Leonard: If I could calm down I wouldn't be having a panic attack, that's why they call it a panic attack.
Sheldon: All right, all right. Well, just sit down. Yes, sit down, now close your eyes.
Leonard: Why?
Sheldon: Just do it.
Leonard: Okay.
Sheldon: Now try to increase your alpha-wave activity.
Leonard: What?
Sheldon: It's a bio-feedback technique. It's relaxation through brain-wave manipulation. I read a paper about it in the Journal of American Neuroscience. It was a little sparsely sourced but I think the basic science is valid. I probably have it here somewhere.

Leonard: Oh, who am I kidding? I can't go through with this, you need to call her and cancel.
Sheldon: Me?
Leonard: Yes.
Sheldon: What should I tell her?
Leonard: I don't know. Tell her I'm sick.
Sheldon: Okay.
Leonard: Not the kind of illness that will make her want to come over and take care of me, but nothing so critical that she'll feel uncomfortable going out with me in the future if I want to try this again.
Sheldon: Got it. So I'm assuming nothing venereal. I'll just tell her that you had a routine colonoscopy and haven't quite bounced back.