When I worked at a Main Dealer (many years ago), we put i.e. cut the roof etc. a sunroof (the popular "pop-up" glass type).....in the wrong car.....!
We noticed the error before the customer arrived....as we were deliberating what on earth we could tell them - the Service Manger - welcomed the customer at the Service desk and "said congratulations you are our customer of the month and as such you get a free sunroof".
The customer was overjoyed...the original customer (with now no sunroof) - had his sunroof fitted the following day.
