Callthe phone company.Just say there is a suspicious box attached to your house and you want to know what it's used for.
Call the police. Seriously. <br />
They are either stealing electricity or cable from you.
Call the police and call the electric company.
Don't go outside and be yanking anything off your house.
If you disconnect anything, you could be exposing a live wire. Also.......take pictures of the wire going from your house to theirs. If you have a webcam with a motion detection ability, set it next to a window near the electric box and hopefully it will work if they are stupid enough to go back to your house. If the house behind you is a rental , notify the owner. He WANTS to know if his tenants are stealing electricity. They are thieves and they are potentially creating a fire hazard with the illegal wire. When they get caught, make them pay you for the electricity they stole, pay for damages and get a restraining order against them. Also, get a no trespassing sign and post it on your property. It carries more weight in court than not having one. Take pics of that too. Good Luck
Thax for the free electric