So in college, my first job was at a restaurant in the kitchen. Wings and burgers. Pretty easy, I was the only person that didn't show up high or smoke on the job (hey I was only 18).
Anyways, in December they post a schedule for the entire month since people leave for vacation. That's fine. Well, the last week of the schedule was the first week of school. Plus that Monday the college football team was playing in the national title game. So first team staff, full 8 people. By then I was the #2 guy in the kitchen - ran it on the weekdays when the kitchen manager had his days off. But, I had class that day. I put in writing that b/c of school I couldn't make that shift. Printed the letter and my schedule and had all 3 managers sign the paper. I copied it and sent it to all 3 managers and the owner. The week before the shift I remind everyone that I"m not going to make it, get someone to replace me. Put that in writing and everyone signed that too - while saying I was stupid, they wouldn't forget. Anyways, no one fixes the schedule. They call me 20 minutes before the game starts and ask my why I didn't show. I didn't answer (my class ended at 7, game started at 9, I was already drinking).
Next day the owner calls me into his office to talk about my 'lack of dedication'. He was surprised when I gave him (well picked off his desk) the notice that I would skip the shift for school with all 3 managers signatures on it, then the other reminder. I smiled, told him if he can't run a business and since he treats his employees like criminals for giving him 4 weeks notice of a missed shift for school reasons, I can't work for him. I quit on the spot. Apologized to the kitchen team (it was a slow day so being a man down wouldn't be that bad), took a shot with them and left.
2 months later, I'm working at another restaurant, 2 of the 3 managers from the first one had quit (something about bad management) and were interviewing at the new restaurant. One of them got the job and about 2 weeks later, I told him that he had to fire a guy that walked out on 2 of his shifts that week or I would walk out, I couldn't deal with the short kitchen and idiots who no-showed. He said he couldn't, I reminded him that I had quit on the spot before and would again. He asked me to stay the shift so he wouldn't look bad to his new boss (being down 2 guys with 1 quiting) and asked me to name my price - 6 hours and 3 pitchers of beer later, we closed the restaurant down and he had to drive me home.
Said he never met a kid with a head on his shoulders before and I shouldn't waste my time in kitchens. I took his advice and never worked in a kitchen again (well except my own, I love cooking). Plus, now I got a free round when I head back to where he was working.
Anyways, sometimes, saying FU is great, but keeping bridges with those with true power matters.