In our last house, we had a neighbor who was pure evil. Since I am good at heart, more or less, I never gave him the rich thrashing he deserved (with the exception of calling the cops when he would destroy our property or peep in our windows). I did dream of having something like this though:
ThinkGeek :: The ThinkGeek Annoy-a-tron
Something like this is perfection for that person that deserves no joy in their lives and that can be driven slowly insane.