I was burglarized a few years ago, and I actually got back some of my stuff! The dolt who robbed me, robbed some other guy who had an 'idiosycratic' CD collection and a database of the discs. The cops didn't do much, so this guy faxed copies of his disc database to every used CD shop in the city, and bingo, a shop called him back with a match. The bonehead burglar had even used his real ID while selling CDs and pawning stuff. I got back two cameras (but not my CDs, laptop, nice video camera, etc., etc.) which he had pawned with his real ID.
I'm not a big fan of recording IDs or waiting periods, but there are real world situations where these can actually make a difference in catching theives and recovering property.
Machines take me by surprise with great frequency. - Alan Turing