My cell phone, a pen, a Lego mini-figure, the wireless modem (currently unplugged), the regular modem, a pack of AA batteries, my printer/scanner, the Flip video camera, the mp3 player, the Scott Pilgrim manga collection (borrowed from a friend), and my DSLite (with WarioWareDIY).
Ruling out the DS and the Scott Pilgrim manga collection, I think I could find a way to make a weapon out of these things. But not without outside help.