(More than) One Step Backwards

Our parents had always told us that high school would be an adventure, but my friends and I never truly grasped that fact until we walked into Mrs. Roswater's World History classroom that first day in 10th Grade and saw the big metal box standing in the corner. From then on, our lives would never be the same.
I guess the main reason for that would be the fact that the box was actually a time machine.