I have a big scary cat. He will bite a few chunks out of you. No kidding, the little git is vicious. He barks at flies too...

Strange creature.
Anyway, best thing to do is put the car away in a garage. Personally I'd love to prepare some nice "surprises" for anyone braking into my house. Connecting my keys to a power socket for instance... Apparently this is frowned upon though. It doesn't make a whole lot of sense to me though. Pick any house you care to and I'll bet there are half a dozen life threatening situations you'd be greeted with if you were rushing into it in the dark and not being the owner don't know the place. Odds are good you'll at least brake a leg, unless you are a "professional" at running into other peoples houses in the dark.

Its unreasonable to expect people to keep their houses safe for strangers running in at the middle of the night. Therefore, where is the difference between having a knife rack fall off the wall and kill you, or falling into the open cellar, or slipping on that dodgy door mat... and grabbing a car key connected to 240V? The only difference I can see is that its hard to see why someone would legitimately wire a key to 240V, but last I checked no law says everything I do in my house has to be considered "legitimate" by Joe Bloggs public. Its perfectly safe because everyone who might legally be in the house and taking the key is aware of the hazard. In my opinion once you've bust into my house you've left all your rights outside the door and whatever happens to you is your fault.