The Big Bang Theory2007

[first lines]

Leonard Hofstadter:
The math is all there; it's not real

Penny:
Yes, it is!

Sheldon Cooper:
Yeah, uh, look. It is scientifically impossible for a person tip a cow. Even you with your stocky build and lumberjack shoulders, you couldn't do it.

Raj Koothrappali:
It's horrible. Why would you push a cow over? They're sacred.

Penny:
Oh, stop it. I've seen you eat a million hamburgers.

Raj Koothrappali:
Hey, an animal can be both sacred and delicious.

Penny:
I'm telling you I've done it, okay? I clearly remember the cow standing up and then the cow on its side.

Leonard Hofstadter:
Were you drunk?

Penny:
I was sixteen in Nebraska, what do you think?

Leonard Hofstadter:
I think you're the one who fell over.

Penny:
That would explain why the sky was also on its side.