A good few years ago, I was between jobs so took a contracting position with an IT support company.
I was sent out with a team of others to do an upgrade rollout in a production plant.
We were there nights and weekends so we wouldn't be in anyone's way while we worked and had to be on again first thing again the following day to troubleshoot any issues.
All went well and 99% of the staff were understanding and put up with us until our final week.
I was told to report to a particular office. As I headed down the corridor, I could hear a woman screaming in distress. I walked in to find everyone crowded around a desk. A woman was staring at the screen and screaming and screaming. Another woman told me that I "Must fix this mistake and fix it fast."
Screaming woman stopped screaming and rounded on me "Did you do this?" pointing at her screen. I replied that by, this, she meant upgrading her computer, then yes. So, she lunged at me and called me a fucking bastard.
My crime, I had installed the new software which had a theme in the corporate colours. This theme was deployed company-wide, no exceptions and had been flagged weeks in advance before we even came on site. This theme had replaced screaming woman's Friends-themed desktop which was the only thing that got her through her working day according to her.
I patiently explained that this was corporate policy and that she would have been on a training course for the new operating system but she replied that she was off that week in a tone that left no doubt that she chose to be off that week deliberately. I also mentioned that she would have been sent several emails, the latest sent only the week before. She denied getting the email and everyone else looked at their shoes. So I checked her inbox and 'helpfully' pointed out the email which was sitting unread in her 'Deleted Items' folder. "Oh, I never read those emails so how was I to know."
She told me she would be reporting me to my manager and to her manager and to HR at which I shrugged and went about my day.
I had to return to the office later on and her desk was empty. One of the others there told me, with a smirk, that screaming woman had gone home as she was "too upset to work."