I find it interesting that many people fail to realize that the spectro-photometer doesn't read through dirt. They bring in all sorts of crap that hasn't been cleaned in years. You have no idea how often I want to ask "shall I color match that stain?" or "should I use this smudgy gray spot, it looks to be the cleanest."
We're heading into exterior paint season which means they'll be bringing in boards, and planks, and pieces of rotted wood. That's right, rotted wood which hasn't been painted in 15 years.
Or they'll say "I need that color blue." In fact, it's already begun. Yesterday I had a burly gentleman with little red rubber bands in his beard come to the desk with a piece of fencing. At one point it had been painted white, but that was a long time ago, before it became covered with green algae. And of course he asked "can you color match this?"