Penny: Oh, good, you're up. Look, my car won't start. I need a ride to work.
Sheldon: Did you once again ignore your check engine light?
Penny: No, Mr. Smarty Pants. I ignored the fill gas tank light.
Sheldon: Leonard, Penny wants to exploit any residual feelings you have for her in order to get a ride to work.

Sheldon: Woman, you are playing with forces beyond your ken.
Penny: Yeah, well your Ken can kiss my Barbie.

Raj: [to Amy] If you were having Sheldon's baby, would you really want him in the room?
Penny: Yeah, if he's in the room when they're making the baby, I'll give you $10.

Leonard: If I take it off, Sheldon wins.
Penny: Sweetie, every night you don't kill him in his sleep, he wins.

Howard: Are you planning on kidnapping a woman?
Sheldon: Sarcasm?
Howard: Yes, but mixed with genuine concern.

Howard: I have a two-part question.
Sheldon: Go ahead.
Howard: A: Are you kidding? And B: Seriously, are you freaking kidding me?
Sheldon: A: I rarely kid, and B: when I do kid, you will know it by my use of the word "Bazinga".
Howard: So you're saying the two of you are going to be sleeping in the same bed?
Sheldon: Yes. Bazinga.

Sheldon: Now listen, one of the great minds of the 21st century is about to play host to one of the other great minds of the 21st century. So pay attention. Years from now, my biographer might ask you about this event.
Leonard: Oh, I have so many things to tell your biographer.