A very close friend of mine has three cats...they're like furry nuclear reactors--they're always energetic, and getting into trouble. We compare them to Samus Aran's 'Screw Attack' ability from the Nintendo 'Metroid' game series: both have been referred to as 'a mobile ball of deadly energy'.
Indeed, everything from screws to vacuum tubes is considered a cat toy. Any small, shiny object is fair game!