The Big Bang Theory, Season 11

Sheldon:
I am a respected theoretical physicist. I aspire to win a Nobel Prize someday. But nobody's gonna take me seriously if they find out I've been dabbling in geology.

Penny:
Well, why not? They're both sciences. And I know because they're classes my high school counselor said "weren't for me".

Sheldon:
They're very different. Physics answers the question "What is the nature of the universe?". Geology answers the question, you know, "What'd I just trip over?".

Penny:
All right, well, then don't work with Bert.

Sheldon:
Oh, but I like the work.

Penny:
Then work with him.

Sheldon:
Yeah, but I'm ashamed of the field.

Penny:
Then don't work with him.

Sheldon:
Yeah, but we could prove dark matter.

Penny:
Then work with him.

Sheldon:
But I just think that people...

Penny:
How many times are you gonna do this?

Sheldon:
My record is fourteen.