Order pizza and other food to their house and pick it up at their doorstep claiming that you don't have a house.
Stand over the plants in your yard with a hose and Scream, "I have your life in my hands, bow down to me!". Then point at each one and declare them good or bad plants, while watering the bad ones.
Bring them restraining orders on inanimate objects in their house. (i.e.: chairs, books, lamps, etc.)
Ask them if you can put your trash in their cans, if they ask why say, "Mine are full of bodies", then stutter and say, "I uh mean other garbage." walk away laughing hysterically.
At night transplant the plants in their garden. In the morning say, "looks like they're on the move again."
Build snowmen with name tags of your neighbors. Each day hack off a different part of their body.
Dig shallow graves at night filling your yard with brown grave patches. Make markers out of household appliances.