The Ring of Time

You take a deep breath and close your eyes. Realizing that neither are essential to the whole time travel process, you decide to reopen your eyes. You think, "Twenty minutes back!" hoping that that will be enough to preclude this last incident.

Again, the cosmic Etch-A-Sketch happens, and you mentally shake the picture until you realize that you're back in the seat you had originally taken in homeroom and the teacher has begun asking everyone to tell the class their name and a little about themselves. She finally gets down the row to you. Do you...