Did you know about this? Clover Stornetta Dairy of Northern California (my personal favorite milk producer, apologies to some other prominent dairies) makes milk with extra fat. Notice that label though: more milkfat than state minimum requirements. This isn't straight off the cow by any means -- this milk is made up of constituent ingredients (milk, non-fat milk, and in this case, cream) like most commercial milk, then blended to the required fat content.
Now, I'm not complaining -- this is obviously the easiest way to do it from a commercial standpoint. But it does kinda destroy the image of a pure, natural ingredient.
This post has been dedicated to Richard J. Seymour.