Leonard: What do you want?
Sheldon: It's not what I want, it's what evolution wants. Human beings are primates. Primates have evolved to live in groups, both for protection and support.
Leonard: But you don't like other people.
Sheldon: I do tonight. It's scary over there.
Leonard: It's getting scary here, too.

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.

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: 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 is using a map of the U.S. to find out where he can move*
Sheldon: Penny, you're from Nebraska, right?
Penny: Born and raised.
*Sheldon crosses out Nebraska*

Sheldon: I do not have to urinate. I am the master of my own bladder. Drat.

Sheldon: My new computer came with Windows 7. Windows 7 is much more user-friendly than Windows Vista. I don't like that.