Breaking Bad, Season 1

Walter:
Did you learn nothing from my chemistry class?

Jesse:
No. You flunked me, remember? You prick! Now let me tell you something else. This ain't chemistry - this is art. Cooking is art. And the shit I cook is the bomb, so don't be telling me.

Walter:
The shit you cook is shit. I saw your set-up. Ridiculous. You and I will not make garbage. We will produce a chemically pure and stable product that performs as advertised. No adulterants. No baby formula. No chili powder.

Jesse:
No, no, chili P is my signature!

Walter:
Not anymore.