When I was first out of high school, I worked for Sears Portrait Studios for a few years. In that position, you were not only the photographer but the salesperson two weeks later when the prints came back from the lab. There was a special "display" area where you would take the prints out of the bag one by one to let the customer view them... in hopes that someone would be suitably impressed with the larger, "extra" ones and buy more than the promo package.
Once in awhile, when I had a customer that I remembered as being good-natured and not likely to deck me, I would pull out all the photos one by one and place them as I normally would...except upside down. With as much disbelief as I could muster, I would exclaim how sorry I was that the lab accidentally printed the whole order upside down.
It was amazing the number of times people would ask if they could be reprinted or did they need to go through a whole new sitting. ::Evil Laugh::
