Sheldon: All right, we have defeated the first challenge. Now we must steel ourselves to face the monster who defends the gate.
Leonard: We're trying to get past a security guard. Not rescue Zelda.

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.

Amy: Have you made a decision about the TARDIS? I think I can sell it if we call it Big British Portapotty.

Sheldon: Play that funky music, white boy.
Leonard: I'm surprised you know that reference.
Sheldon: What reference?

Bernadette: Hey, Raj, if Howard can't keep the TARDIS, how great would it look at your place?
Raj: What?
Howard: Yeah, what?
Bernadette: I don't know much about Doctor Who, but if you were to put this right outside your front door and open up the back, it would be like your entire apartment is the inside of the TARDIS. Which is pretty cool because on the show, the inside of the TARDIS is bigger than the outside. But then again, I don't know much about Doctor Who.