The teacher With the changing Face

"I was back in high school, sitting in a class I didn't recognize. The teacher was writing on the board, but every time I looked up, he looked different. Same clothes, same voice, but his face kept changing. He asked me to read a paragraph out loud. I stood up, but the words on the page were moving around. I tried anyway, and everyone laughed, though not in a mean way. The teacher just nodded like I had said exactly the right thing. Then class ended, but nobody got up. The bell kept ringing, and the room slowly filled with desks. I was suddenly standing in the hallway, holding a stack of graded papers with my name on every one. The teacher appeared beside me and said I had been absent for too long. I wanted to explain that I had graduated years ago, but I couldn't remember what year it was. I woke up feeling like I had forgotten an assignment, even though I couldn't remember what class it was for."