coffee

After half a cup, you'll feel your eyes opening and a pleasant amount of sweat beading on your forehead. After the rest, and half of another, the aches in your neck and head will disappear, and your ears will start honing in on sounds you never knew were there. After completion of the third cup, the world will appear like a puzzle, and your eyes will be able to easily manipulate the pieces from a rooms length. After drinking a 4th cup, you will feel uneasy sitting still. You will stare at one focal point, but only pay mind to your peripheral field. You will start to feel nauseated, and realize the only way to stop the nervous energy is to do something. You've just drank 4 cups of coffee.