Many year ago my grandmother had a '61 Chevy that she drove to the grocery store one day. When she came out, she put the groceries in the back seat and drove home. When she got home she reached up to grab her garage door opener from the visor and found it wasn't there, but there was the sleeve with the registration card....in someone else's name! Yup, she took someone else's car home! Her key fit the door and ignition in another car the same year, model, and color. Needless to say, she practically broke the sound barrier returning to the store. Luckily the other owner was still inside so there was no confrontation but it would have been interesting to see what the other owner thought when he came out and found his car wasn't parked where he left it. (the original spot had been taken by someone else by then)