Raj: Hey, you guys have any plans for Valentine's Day?
Leonard: Three months from now? No.
Penny: What? No?
Leonard: I mean, secret romantic plans that would be ruined if I told you.
Bernadette: What's going on, Raj?
Raj: Well, how would you guys feel about going to India for my wedding?
Amy: Oh, that's so exciting!
Leonard: Penny, you will never guess what I have planned for Valentine's Day.

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: So the doctor prescribed Nizoral and it blocked enzyme action, and the fungus cleared right up.
Mrs. Fowler: That's a very disturbing picture.
Sheldon: Yes, well, they say a picture's worth a thousand words, but I say nothing beats a picture and a thousand words.
Mrs. Fowler: Still, you might want to take it off Facebook.
Sheldon: Oh, no. It's in my nature to share.

Howard: Hey, have you checked the dates on these? They're all expired.
Stuart: You buy candy in a comic book store, you get what you get.

Amy: My mom thinks that Sheldon is the reason I don't spend a lot of time with her.
Penny: Well, why would she think that?
Amy: Because I told her. You need a cup of coffee? Wake up!