So my day job is to take calls from people who have computer related problems from within the corporation. We build our own point of sales system, our computers are built in-house with specially built motherboards directly from the local Intel, Windows XP has been so thoroughly modified that microsoft tells us that it isn't their operating system any longer, and pretty much everything that the branches use throughout the world is very specifically create, purchase, modified, and sent to them for the purpose of the business. It's a worldwide corporation and we have around a thousand branches.
So when I take a call, I pretty much know exactly what caused the issue, and how to fix it. When I get a call like I did this morning, which is a normal call where someone touts their horn about being with the company for X amount of years, and it's never ever worked the way that it just did this morning, I can say without a shadow of a doubt that the person isn't correct and work from there. Normaly I'm really good at not really coming right out and saying, "Hey, you're wrong." Normally I am the nicest person and you'll never know that I'm mocking the crap out of you internally and you think I'm the best person. Unfortunately - that was not the case today.
I had this call from some woman who claims that the point of sales system DOESN'T work the way that it's been designed to work for the 5.5 years that I've been with the company. Did I mention that I work in the office that CREATED the software? She kept going on and on... and I snapped. I was the typical rude computer tech on the other end, complete with stupid response to challenge her to have her district manager call me after she asked who my name was so she could tell her DM what I told her.
It was my first call for the morning. If this becomes a trend, I am taking the rest of the day off.