I had a little airsoft pistol I'd scare the cats away from my deck. It really couldn't hurt them, but they learned to respect it! They'd hear it getting cocked and bugger out!
One of my FAVORITE things was to sting the squirrels in the feeder. I'd get in my daughter's room downstairs and open the window. Man they JUMP when you hit them in the rear with an airsoft pellet.
