I was presales for an enterprise software company that got called in propose a solution for a VERY large company which is heavy in equipment. (I am being intentionally vague here.) Some of their equipment moved from one piece of equipment to other pieces of equipment. Picture a big box with little boxes inside. You could move a little box from one big box to another big box. Each of these little boxes had to have a record of everyplace they went, which meant that they had to be identifiable.
This organization somehow had been loosing track of the little boxes, and would arbitrarily reassign ID numbers to boxes. They said something like the ID tags would fall off or some sort of nonsense. Since this caused regulatory problems for them, they came up with a project called the "Permanent ID Project" wherein they would use software to keep track of the little boxes.
The first question out of someone's mouth during the demonstration of how we would track the "permanent" ID number of a box was "You know that ID number you just showed us? How would we change that?"
This organization had "incredible unique and specific needs."