The Big Bang Theory, Season 3

Sheldon:
It's a warm summer evening, circa 600 BC. You've finished your shopping at the local market, or agora... and you look up at the night sky. There you notice some of the stars seem to move, so you name them planetes or wanderer.

[Penny puts her hand up]

Sheldon:
Yes, Penny.

Penny:
Um, does this have anything to do with Leonard's work?

Sheldon:
This is the beginning of a 2,600-year journey we're going to take together from the ancient Greeks through Isaac Newton to Niels Bohr to Erwin Schrodinger to the Dutch researchers that Leonard is currently ripping off.

Penny:
2,600 years?

Sheldon:
Yeah, give or take. As I was saying: It's a warm summer evening in ancient Greece... Yes, Penny?

Penny:
I have to go to the bathroom.

Sheldon:
Can't you hold it?

Penny:
Not for 2,600 years...

Sheldon:
Alright, go then.

[Penny goes off and Sheldon goes to his computer]

Sheldon:
[voice-over] Project Gorilla: Entry Two. I am exhausted.