I've only been fired from a job once. After graduating from the University of Belgrade, I was hired as an instructor in my old department while doing a master's degree there. The system there works differently than in North America, and these positions (lektor, asistent), which are real junior faculty jobs, are held while you do your master's and Ph.D., at which point you are hired as a docent (assistant professor). Well, after ascertaining that I wasn't sucking up to her sufficiently, my advisor, who pretended to be my good friend, (as I found out much later) stormed into the department chair's office and demanded that either I be dismissed or she would leave. So, the guy, who was a major pushover, called me the evening before the beginning of spring term, as I was prepping for class, to tell me not to show up the next day.

My revenge has simply been to become more successful and better-known in my academic field than the people who had me fired. Fast forward about 17 years, I'm a tenured associate professor in the US, in a leading program in my field (on the global level), hold a Ph.D. and have postdoctoral training from two extremely well-regarded universities, have a strong publication and grant record, and have graduate students with more impactful research and publication records than the people who had me fired.

That's all the revenge I need.