I came very, very close to walking out at my last job. I worked at a fast food restaurant in a mall food court, and it was pretty awful aside from a few people. My favourite person to work with was easily my supervisor (the only other guy working there), but after I had been there for about a year he took a few months off for paternity leave. And oh man, those were the worst few months of my life. The worst part of it was how he worked the closing shift, which was easily the worst shift to work there, and when he was gone the manager and other supervisor decided to just drop the closing shifts on me. But whatever, I could live with closing shifts, right?
No, because it got worse. He had been a pretty strict supervisor, and always made sure people got things done. Without him, some things just didn't get done. So many days I would show up at 5 to a mountain of garbage, empty freezers and coolers, and everyone would instantly leave and expect me to do everything. Just for the record, since we were in a food court, we didn't have an adjacent stock room. Our stock room with our walk-in freezer and all that was up a flight of stairs and down a hallway. Being the only guy there at the time, none of the girls wanted to get stock. None. For no reason other than the fact they were female. So, let me get this straight. They expected me to prepare food for customers, wash dishes, do prep, take out the garbage, and stock all the freezers/coolers... while working alone... because the girls I worked with were lazy. Don't get me wrong, I'm not sexist -- some of the girls there worked very hard and were awesome to work with. I understood that a few of them literally could not get stock on account of being about 100 pounds lighter than me and barely an inch over five feet tall, but the majority of them were very, very able to do the job.
I got fed up one particularly brutal night where I had to stay an hour past schedule and left my manager a surprisingly calmly-worded note asking for some help during my shifts, since things didn't get done the day. The next day when I showed up for the first day shift in weeks, she essentially told me I was being lazy and that the other people who closed on the days I had off had better service times than me and did a better job closing. She then handed me keys to the stock room and told me to fetch some stock, because the three people who had been there for a few hours already couldn't be assed to, apparently. I went upstairs, kicked a hole in a box, raged for a bit, and seriously considered just walking the fuck out and leaving them hanging.
In retrospect, I think the only reason I didn't march out that day was because my roommate was one of my coworkers, and I really did not want to hear her ***** and whine about being made to actually work if I left. Needless to say, as soon as my supervisor was back from parental leave things got much, much better around there.
Nonetheless, a few months into university I got sick of the job and put in my two weeks notice, saying I was going to join up with the reservist regiment in my city. The exact day I handed in my application papers, my art history professor offered me a job as her research assistant. I jumped on it in a heartbeat. The work is much easier, much more fun, and pays a lot better.
... Never ever working fast food again.