Eating with your fingers is much more satisfying then eating with a knife and fork. When you eat with your fingers you feel somehow closer to nature. Whether it's a chocolate chip muffin, or a T-bone steak it is just such a thrill to tear it apart with your bare hands. This behavior could be something that has been passed down for generations since the beginning of the human race. Back then we had to hunt and kill our meat. It took effort to eat, not like today, where all kinds of food are cheap and very available (at least in the First World). It was a simpler period that we all want to get back to on a certain level. So just remember the next time you forget your table manners and start throwing bloody gobbets of meat around the room. You are only doing what comes naturally.