Well, Sir, it just so happens that I am a recombinant DNA chemo-geneticist, and all I had to do was reverse the E3h chromosome with the PP4-25 marker, so as to turn the selected cow's secretion of endocrine hormone 23T into chocolate syrup...voila, she now lactates chocolate milk. You're welcome.
Butler, I seem to have misplaced my last uranium-235 space modulator. I need to destroy the Earth(it's blocking my view of Saturn), and since Marvin the Martian is the only known being to possess them, and he's a cartoon character...well, you see the quandary. Your problem, though.