Leonard: There has got to be a right decision based on empirical evidence. Look, I made pros and cons lists, and then I came up with three different scoring systems to determine the best project. I just don't know what scoring system to use. So I'm working on a meta-scoring system to score the scoring systems, but the math is really complicated. You want me to walk you through it?

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Leonard: Penny, as a scientist, my job is to figure out why things happen. But I don't think I'll ever understand how someone like me could get to be with someone like you. You know maybe I don't need to understand it, I just need to be grateful. I love you, Penny.

Sheldon: This song is never going to stop. Have you ever dealt with something so relentlessly irritating?
Leonard: That's a trick question, right?

President Siebert: So, there are some funds left in the general administrative grant, and I need somebody to decide how we should disburse them.
Leonard: Really? Wow, what an honor. Thank you. So how do I decide who gets the money?
President Siebert: How do you decide anything? Think about it with your brain, and then say it with your mouth.

Sheldon: All right, I've kept you in suspense long enough. "Dutch" is a bastardization of the word "Deutsch," meaning German.
Penny: What's German for "annoying"?
Sheldon: Nervig. Why do you ask?

Sheldon: This reminds me of a traditional Amish barn raising. With everyone pitching in.
Howard: How exactly are you pitching in?
Sheldon: I don't hear anyone else giving facts about traditional Amish barn raising.
Leonard: The rest of us are pitching in with hammers and nails.
Sheldon: Well, facts are my nails, and my voice is the hammer which pounds them through the wood of your skull.
Penny: Well, that is how it feels.