milk

A green mechanical scraper moves along the floor of a barn, pushing a pile of manure and straw forward beneath a line of standing black and white cows. The scene then shifts to a close-up of the scraper's tines cutting through the waste, followed by a view of the waste being processed in a large rotating drum, then transported on a conveyor belt, and finally shown as neatly arranged chocolate bars on a production line, with two people in white lab coats and hairnets inspecting the finished product.