My friend had a problem with his cat hopping up on top of his fridge, and peeing on his cupboad.
So we rigged a aluminum foil and cookie sheet shock pad with a large 6V battery... the theory was if his feet didnt get buzzed, then his stream of **** would hit the cupboard, trickle to the foil funnel we also fashioned and wired, and complete the circuit from his feet to his pisser.
That night we waited in the dark and sure enough, it worked...
we hear the following:
-hop onto counter*
-*hops on top of fridge*
-*sounds of fluid on foil*
-"Mrow? MROOW MRRRRRRRRRRR!!"
-*panic jump and thud onto ground, scurries off*
Went to go inspect, found literal shreads in the foil where he aborted his territory security.
The cupboard has been forever free-human territory after.
Bella, greyish coonish and now dead not so ish. someone got a combo, Bella and another cat I'd never seen chased each other down the end of my street and onto a major thoroughfare. from kitten to 4 years, no particular order. and Annabelle, the senile 18yr old calico, always an indoor. still kicking around the house.