-bathtub chains
-pennies
-electrical wires
-necklaces
-magnets
-fingers
-metal cutlery
-nails
-bells
-space heaters
-sink faucets
-bobby pins
-cans
-bottlecaps
(will eat ice cream but no other human food.)
-ballpoint pens
-Bic lighters
-Styrofoam packing
-plastic cutlery (of which there has been a lot of in my house recently)
-straws
-USB cords
-plastic bags
-Nuva birth control rings
-plastic shower curtain rings
-Qtips
-the tops of takeout coffee cups
-plastic spatulas
-toothbrushes
-broken glass
PS If you're still stuck for a Halloween costume, I think you should take Christine O'Donnell's advice
"She pointed to a cardboard box in the kitchen—the kind that 12-packs of Coca-Cola come in—and told him to cut a hole in the middle and put it on top of his head. We weren't sure what she was suggesting.
"You can go as a cokehead!" she said, bursting into laughter."