I had given up on the machine in the post-room, which was churning out blank paper.
By the time I got to the third photocopier that was churning out blank paper, I realised that I had the originals the wrong way up.
What a prat I am. Three quarters of an hour wasted by my own stupidity.
Later, I watched the student's faces as they watched a J-pop video.
How I wish I had filmed them!
Watch it, and see if you can catch sight of your face in the mirror.