PS2 style USB controller. Vicious whip. Can strangle with it. Good Bludgeon. Most importantly, I bought a XBOX 360 one to replace it and is much better so it's just sitting in my desk doing nothing.
Aside from that, I would make some make-shift shanks from the beer cans in my waste paper bin.
I could smack him with a roll of carpet which I do actually have in my room.
Maybe the head-less broom handle I have...