Penny: Oh, hey, if you guys are free this weekend, I won a night of wine tasting from work.
Leonard: That sounds fun.
Leonard: How come scientists don't win free stuff like salespeople do?
Howard: 'Cause we're not in it for the stuff. (Puts his arm around Bernadette) We're in it for the groupies.

Howard: You know, I'm really glad you decided to learn Mandarin.
Sheldon: Why?
Howard: Once you're fluent, you'll have a billion more people to annoy instead of me.

Bernadette: Maybe we should get one of those machines to help her up the stairs.
Howard: You mean a forklift?

Sheldon: Sheldon Cooper does not cry.
Howard: That's true, you'd rust.

Leonard: Hey, did you ever think about the military applications for the guidance system?
Sheldon: Of course.
Leonard: Does it bother you?
Sheldon: No, it did at first. But then I talked it through with Frank and Alicia, and they really helped put things into perspective.
Leonard: Who are these people?
Sheldon: Leonard, friends are like toilet paper. It's good to have extras under the sink.

Raj: Yeah, okay, just do me a favor and stop talking about how great Claire is.
Zack: Anything for you, my little foreign friend.

Zack: I see what you're saying. She's not so great.
Raj: Don't listen to him. He says crazy things all the time. Uh, watch. Marco.
Zack: Polo.