You had just finished an intense movie late on a Saturday night, and you were ready to crash. But your roommate was playing a loud game with the volume turned all the way up. Frustrated, you stormed into his room, pillow in hand. "Turn the volume down!" you shouted at the top of your lungs. "No way! I'm almost winning," your roommate yelled back, his entire body tense with concentration. He was so focused on the game that he was close to winning that sweat was dripping down his forehead. You could see the determination in his eyes.