You remember the trick for getting out of the mobius house now. It's been so long since you set foot outside that it takes you a while to remember how it's done. The trick is not in the door, but the window!
Carefully, slowly, you edge towards the window. You peer outside and there is the boy. He screams and screams. For a moment he stops, and you think that maybe you should shut the curtains and forget about him. But then he starts to scream again. You've got to get out there and shut the little bastard up.
Looking around your room, you notice that there's hardly anything there. What will you use to smash the window?