The divorce was messy. The kids are now your full responsibility. You are filled with rage. Is it time to focus that hateful energy towards the cute new family that just moved in next door? Yes, of course it is.
Invite them over for dinner and feed them spoiled meat.
Call the cops on them for murdering your dog (You don't even have a dog).
Ask to borrow a cup of sugar, take it home, make caramel out of it and dump it on the windshield of their car.
Kidnap their children and leave them at your ex-husband's house.
Blow up their house.