Not really a FU money story (as I didn't have FU money at the time), but I did have another job lined up, so this is close. I finished my Master's degree and moved to the DC burbs to work with an "8(a) subcontractor". I quickly found out working for 8(a) companies is a bad idea (unless you're not very talented). The woman running the company (15 employees) was a royal pain and while charging over $100/hr. for our work was paying us about $20/hr.(benefits may have bumped it to $25/hr.). And then she would try to find ways to save an extra dollar here or there and didn't worry how much it aggravated us (while she was always in late or leaving early to deal with her child and live-in nanny). My favorites were when she tried to not pay for coffee at our rented offices (to save maybe $20/mo.) and when she didn't want to pay for parking under our building but pay for a nearby lot to save $8/mo. But only for the guys there ("Its too dangerous for the women to walk over there"). She did lots of other things, but those two stuck out.
Anyway, I found a job with a 50% pay raise after one month of looking, so I came in on a Friday planning to give 2 weeks notice. First thing the other guy working on my project tells me is that he is giving a 2 week notice today to her. I congratulate him but otherwise keep quiet. At the weekly company meeting later that day, another guy is there chuckling about how he has another job and he is giving his 2 week notice. "Can you believe we're doing it on the same day. <boss lady> is going to be really pissed." I give him a very blank look and say "What makes you think you'll be the last one to resign today?" He laughs for a few seconds and stops when he realizes what I am saying. He couldn't keep himself from grinning during the meeting.
You would think having 20% of your employees quitting on the same day would have an impact on her, but nope, still the same b**ch. On my next to last day we are to meet her early that morning (before 9:00) at the client's office and work on their computers and install needed software. She barely makes an appearance and after 30 minutes heads out saying we are to stay there when done so we can go over everything that happened with her when she returns (this could easily be done the next day, but whatever...). She then never returns. Well...we wait and wait, and wait, and wait... I guess she did return at some point, as I didn't hear anything from her and finally I left at 4:30 (I hadn't eaten since breakfast at that point). Next day, my last day, we have the company meeting to review things for the week, and she has the bells to point out I left without waiting for her and wanting an explanation as to why. I'm sitting there thinking she can't be serious: "Its my last day and she expects me to back down from that - well guess again." I clear my throat and start and review everything that happened yesterday, what she did, pointing out lots of mistakes in her behavior, and what I did, and end with "and that's why I left when I did". After a few seconds of silence she starts in on the next item on her agenda never to bring that up again.
It would never get to that point with me any more. I have enough that while not rich, I would survive just fine for a year or two until I got another job.