Okay, so I'm playing tennis, and I'm chosen for a demonstration. The teacher told me she was going the throw the ball to me, and I had to hit it back to her so it landed near her hands. So I stand there, waiting for the ball, and when I don't expect it, she throws the ball at me. I spin around, and hit the ball hard. I didn't realize how hard I had hit it, because before I knew it, the ball had wacked my teacher RIGHT on the chin, then it rolled away into the corner.. o_e