The Big Bang Theory, Season 4

Penny:
Okay, well, what do you communicate about?

Sheldon:
Well, my work in Physics, her work in Neurobiology and, most recently, the possibility of our having a child together.

Penny:
[spits out her beverage and is offered a napkin by Howard's robot] Thank you.

Leonard:
Wait a minute, a child? You never see this girl, you just email and text and twitter, now you're considering having a baby.

Sheldon:
Amy pointed out that between the two of us our genetic material has the potential of producing the first, in a line of intellectually, superior, benign overlords, to guide humanity to a brighter tomorrow.

Howard:
I'm guessing that future historians will condemn us for not taking this opportunity to kill Sheldon.