The mad scientist in me says to use a microwave magnetron pointing at the neighbor's house to fry all their 2.4 GHz stuff.. Could that work in principle?
I used to fantasize as a kid about doing this to a satellite. Phased array of cheap magnetrons and all that. I doubt that would work though.
Also circa 1kW not a safe thing to be spraying around, I think fleshy things might well be damaged.