Great. You have gotten a big F on your science test last week. Now you have to do lunch detention with your teacher, Mr. Yang, which is not a nice place to be...

You say bye to your friends eating lunch in the quad, then head toward room 218: your science class. When you go inside the classroom is dark, empty of nothing but the whiteboard and desks -- nothing like it had been the last time you were in there, just a few hours ago. Perhaps it was always this way for lunch detention? You don't really know. You sit down at your desk, in the back, in the corner (of course). Then you pull out your textbook, thinking you would have to copy notes...or write lines...but the teacher is nowhere to be seen.

Goof off time!! ...right? You look around the room then stare at your textbook, smiling to yourself. Suddenly the door swings open and you hear a dull thunk and "ack!", but nobody is there. At least you think nobody is there.

Seconds pass. Near-silent footsteps seem to pace around the room, and you can swear you hear the sounds of breathing. Suddenly, a pair of oval-framed glasses appear a few feet above you.

"What are you waiting for, the principal?" your science teacher's voice says from above you, the glasses tilting sideways slightly.