There was a prog on BBC3 (in the UK) called "the real hustle" where they show scams, tricks and thefts, one of the presenters posed as a parking garage attandant and told the first customer that it was valet parking. This bloke then handed over his keys and the presenter did excatly this, put the satnav on and hit the home location, saying that he now knew where the bloke lived, and that he wasn't home. (They give the stuff back once they have let the victim discover that they have been ripped off, and then ask if they can show it).