Penny: Tweety Bird tawt he taw a what?
Sheldon: A romulan.
Penny: Yes, he tawt he taw a romulan.

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.

Sheldon: Teams are traditionally named after fierce creatures thus intimidating one's opponent.
Raj: Then we could be the Bengal tigers.
Sheldon: Poor choice. You know, gram for gram no animal exceeds the relative fighting strength of the army ant.
Raj: Maybe so, but you can't incinerate a Bengal tiger with a magnifying glass.

Wolowitz: That's more like we're a tall thin woman who wants to make a coat out of your Dalmatians.

Raj: I say we wait until he looks at us then laugh, like "Yes, you're a smart and strong competitor but we're also smart and strong and we have a reasonable chance of defeating you".