I call the person the Gustafson!
Everyday I come in I find an empty to a "one last sip to go" bottle of Gustafson's chololate milk. The bottle is about 16oz in weight, give or take an overload or error.

Now I don't mind that the person is stealing some chocolate milk. I mean come on, chocolate milk is pretty awesome. It combines two of the most sacred things: Milk (A common household beverage) and Chocolate (A plague of sweetness in your mouth that may or may not bring sexual arousal-ness).
What I care about is that its GUSTAFSON'S MILK!!!!! Have you seen the picture on the bottle!?!?! Its mad! Please excuse my picture taken from my phone, it does not take the sheer terror into focus.
See the rather plump older gentlemen behind his wife in the seal. The man's face reads "I beat my wife with a baseball bat of money, while drinking my own fatty milk!" Then the wife, so skinny and unhappy to the eye of the beholder. Then if you take a detour out of the seal you see the cattle from which the milk comes from. Yes yes, we see it now. Get your best cow in the picture! All the others are too week to stand from being underfed! Maybe thats why the milk tastes so darn rich? Its not vitamin D added, but malnurisment added!
But hey I could be wrong. Heck, I haven't had that kind of milk in years. Since I have gone vegan, I don't even remember what milk really tastes like.
On a sour note ending, "Up yours Mr. Gustafson!"