Dairy. and also Aliens.

I was thinking about cow's milk

in that it's produced by cows, for baby cows.

not for humans.

I'm sure with enough money and research you could prove Milk is BAD

and then someone else with more money would prove that not only is Milk GOOD but also that the first research team were a bunch of racist pedophiles with no credibility.

but this isn't about that (Money),
this is about Milk

I imagined the eventual colonization of Earth by aliens.  The mother and father alien arguing at the morning table:

"Go wake that lazy boy of yours up, Glargamel.  He needs to milk the human!"

"Ah let him sleep, Glargamass.  He had a tough night..."

"You are too easy on him, he needs to learn that our girl is a LIVING CREATURE and that if you don't milk her at the same time every morning she gets real bitchy..."