Leonard: Come on, she's your friend. Step up! [Knock * 3] Amy. [Knock * 3] Amy. [Knock * 3] Amy. (Turns to leave) Bye!
Sheldon: Where are you going?
Leonard: I'm single, I don't need this crap.

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.

Leonard: If you're worried, we can go over there and see if she's all right.
Sheldon: Okay. You know, I heard in the news a bobcat has been spotted in her neighborhood.
Leonard: I don't think Amy was eaten by a bobcat.
Sheldon: Who thinks Amy was eaten by a bobcat?
Leonard: You do?
Sheldon: Leonard, I was just mentioning an interesting local news item. Now, thanks to you, I'm worried Amy's been eaten by a bobcat.

Sheldon: I can't seem to get in touch with Amy. I tried e-mail, video chat, tweeting her, posting on her Facebook wall,texting her, nothing.
Leonard: Did you try calling her on the telephone?
Sheldon: The telephone. You know, Leonard, in your own simple way, you may be the wisest of us all.

Sheldon: New topic: women. Delightfully mysterious or bat-crap crazy?