But in the time between when something gets thought and when it gets done, the ball hit me square across the side of the face. I fell, the back of my head slamming against the gym floor. I then stood up immediately, as if unhurt, and left the gym.
Pride had gotten me off the floor of the gym, but as soon as I was outside, I sat down.
"I am concussed," I announced, entirely sure of my self-diagnosis.

Author: John Green