Back when I started at my current job in construction, I never expected to use any of my graphic or design training, However, when our company started doing more charity type work eventually it got out that I was semi-competent with some design software and I became the guy who designed the posters/flyers/etc for client companies without assets.
It was, and still is really enjoyable to use my skills to help, but one thing really sticks in my mind as a perfectly legal revenge story.
One of the first things I worked on was a mock-up poster for a local council. They were running an event for our charity partners. They sent over any resources they could find and it was a typical mash of some really low-res pictures with nonsensical text but I soldiered on.
After trashing my original artsy draft they settled on the mockup with pretty solid color choices and a nice clean layout (Which looking back I now much prefer). That was a good first step, but what you need to understand is that this was only a mockup to be finished later - the assets were unfinished, text was not aligned correctly, the works.
As you can probably guess, they steamrolled ahead with the mockup anyway saying it would do, and it went to print. To this day, and with bitter glee, I still enjoy seeing they are using one of the assets I created for that mockup, the "high res" logo. See, it was actually a scan taken of an old newspaper, from back when they did a cover piece on the council.
I shrunk down a high res scan and used that as my placeholder for their logo (the original sent during the project was a 200kb jpg). But it still has the dots from the printing press visible, they rushed ahead before letting me vectorize it.
And now, every letter they send out, any time they bill another company or provide a "high-res" logo copy, they send my 10-year-old newspaper scan. And, everytime I see those tiny dots I smile a little.
I could tell them. I could send the vectored one and tell people, I made that when I see it. But instead, I leave them using the crappy one and remind myself to use a watermark on any mockups.