She knows she's been Dated

Howard: Here we're gentlemen, the Gates of Elzebub.

Raj: Control, shift, B!

Sheldon: I am the sword master!

Leonard: Penny's fine, the guy she's kissing is really fine and...
Howard: Kissing, what kind of kissing? Cheeks? Lips? Chaste? French?
Leonard: What's wrong with you?
Howard: I'm a romantic.

Howard: Sheldon, if you were a robat, and I knew and you didn't. Would you want me to tell you?
Sheldon: That depends. When I learn that I'm a robat, will I be able to handle it?
Howard: Maybe, although the history of science-fiction is not on your side.
Sheldon: Uh, let me ask you this. When I learn that I'm a robot, would I be bound by Asimov's three laws of robotics?
Raj: You might be bound by them right now.

Leonard: Hey, what's going on?
Sheldon: The internet's been down for half an hour.

Leonard: We tried kissing, but the earth didn’t move… I mean any more than the 383 miles it was gonna move anyway!

Sheldon: Oh, I've seen that look before. This is just going to be two weeks of moping and tedious emo songs, and calling me to come down to pet stores to look at cats.

Leonard: "She says, you don't know me and you don't even care... oh yeah."
Sheldon: Oh, good lord.

Leonard: You're right. I didn't ask her out, I should ask her out.
Sheldon: No, no, now that was not my point. My point is, don't buy a cat.
Leonard: No, but you're right. I should march over there and ask here out!
Sheldon: Oh, goody, we're getting a cat.

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.