Sheldon: *knock knock knock* Dr. Wolcott? *knock knock knock* Dr. Wolcott? *knock knock knock* Dr. Wolcott? [sound of many locks clacking]
Howard: That's a lot of locks.
Leonard: Mm. That was a lot of knocks, they were made for each other.

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.

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

Leonard: My point is, while you're spending all this time on your own, building computers or practicing your cello, what you're really doing is becoming interesting. When people finally do notice you, they're gonna find someone a lot cooler than they thought. And for those of you that were popular in high school, it's over, sorry. Thank you. Congratulations.

Sheldon: Well, of course I'm worried about you, I want you to be safe.
Amy: And I want you to be safe.
Sheldon: I will be. I'll have my friends with me. If anything should go wrong, I can use them as human shields.

Doctor Wolcott: Well, let me show you around. This is the chair where I do most of my thinking, my thinking about work. Now, my thinking about people who have wronged me, I do over there.
Sheldon: I've always said that I should get a grudge chair. Leonard, have I not always said that?
Leonard: Mm, you have, but you were worried you'd spend too much time in it.
Sheldon: Yeah. That is a real concern.

Doctor Wolcott: Yeah, I'm a married man myself.
Leonard: Oh, really? Is she here?
Howard: And alive?
Raj: And can people other than you see her?