I do not see a Rock?

"Umm, I am sorry. I wish I did not bring it down to class today, and that I left it in my locker, so that you did not see it," I said as I held on to the rock tightly. Just as I finished saying it, the rock disappeared from my hands. "What rock are you talking about, sometimes Jon, I wonder if you got hit on the head with a really big rock. I said go to the locker room and get changed, class is over," was Coach Jefferson reply. Nicole and I left with the others from the gym.