Posted: 12/04/2015 at 11:12
Water pistol? Meh! Paintball at least. Pow'R Ball if possible.
I kid. I kid. Don't use Pow'R Balls on cats. Use blue-tip Safety Slugs. No ricochets.
I like the bbq skewer idea, actually. Give them to room to sit down. You could also achieve that with wire stretched across posts, but you have to make sure the wires are too close together to a cat to sit between them and that could be a lot of posts, so it's probably better to put chicken wire on or stretch a lot of wires across a wooden frame, and mount that on posts. You'll have to do something at the sides, too, or they'll just go underneath it. Snares*ahem* More wires, I suppose, or boards ... but now this is turning into "turn your entire garden into a collection of cold frames because the local cat-lovers are inconsiderate and irresponsible," and even if you *do* all that construction work they b______d things will still back up to and pee all over your front door.
Maybe you should get a lot of photographs of other people's cats and make up "MISSING" posters for them. If you can convince the town that cats are disappearing off the streets at an alarming rate, maybe people will keep their cats indoors.