In my experience, it's not just an outside electric socket that may be "borrowed", I've known cases where neighbours pools have been filled or topped up using someones outside tap while they're away - and it's not just Turkey, Spaniards feel comfortable "borrowing" things at time. In fact, we are currently "borrowing" electricity from somewhere/someone and even our electrician can't work out where it's connected!
Agree with all the above comments regarding electricity, switch everything off at the consumer unit when you leave and then if you do get a large bill, it's time to check who's got keys...
JF