On the farm where I grew up, we raised Black Angus cattle. In order to corral them for tagging or medicines, dad would drive the truck through the fields and I would sit on the tailgate. As we approached a group of cattle, I would rattle a bag and pour a small amount of the contents onto the ground near the animals. But this was no ordinary food; it was, “sweet feed,” a pellet shaped feed (like dog food), covered in molasses. After tasting, they wanted more. They hear the bag rattle and smell dessert. Soon they leave the green grass and follow the truck all the way to the barn. They are controlled by a desire for that treat.