While working in paint, we had a concrete sealer to repel dirt and water on garage floors that was typically meant to be a top-coat to garage floor paint. So this guy comes in with his wife/partner and wants more of it and both them look like they live in a poverty-stricken trailer park. They had done a formula change on the clear sealer so the old one was gone and the company doesn't inform you if there was going to be a replacement or not. I told him I was out and I wasn't sure if I could get a replacement. He then asked if I could special order him some but the way that works is it can be done but it has to be a whole case which had four gallons.
Well he only need one, and that was a big conflict. If I had been him, I would have gone somewhere else and gotten a similar thing especially with it being a clear sealer. It's like if one place stopped carrying a brand of polyurethane for wood, well you can get polyurethane anywhere else, two aren't that much different as long as you don't change from water-base to oil-based or vice versa. He threw a big fit about how my work wasn't going to give him something to help him finish his project and would not take "no" for an answer while becoming a big angry man-baby. He eventually left and my co-worker Pat says she knows who he is and he does that kind of crap all the time. I really hope karma bites him hard one day.