Have a cat that won't stay off your counters? I do. I finally got fed up with it enough to do something about it: scare the crap out of him with a motion-detecting blender (while recording the results for my own amusement, of course).
Link -via Cynical-C
I have to rigup something like this to keep my cat from nosing open the lower cabnet doors and chewing on plastic things.
... or wasn't is for frogs? ;)