Working at the JRO. I had signed a contract for 6 months, but I had to quit at the end of the 5th, otherwise I wouldn't have made it. I had lost like 5Kg (and I'm thin, so that was a very bad thing as you can imagine) and was feeling a lot of anxiety and depression. First, the boss reassigned me on the first day to a different post than the one I had been hired for, and it turned out to be something a chimp (OK, maybe not a chimp, but any elementary school kid) trained to use a calculator could do. And he would look at me badly whenever I helped the guys working on DSP'ing the data samples taken by the antenna or exchange comments with the webmaster. And the place was in the middle of nowhere, there weren't any birds chirping or anything, the silence was depressing. To make matters worse, my assigned office lied away from the main complex/building and nobody else used to go by, and even though I don't like much to talk to other people, I like to listen to them or at least watch them passing by. Then the Human Resources manager (who had originally interviewed me and hired me and with whom I used to have conversations during lunch time) was forced to resign when one of the bosse's "godchildren" arrived and he needed to place him in some position, even though the guy was totally inadequate for it. One day I broke a tooth during lunch and the first aid kit had nothing in it but spiderwebs... and the nearest sign of civilization was a dump a few Km away (we depended on the lab's van to get in or out, and if it wasn't scheduled to go out, or you missed it at the time it went out, you had no choice but to stay there - the worst that could happen was to miss it on thursday afternoon, as it wouldn't come back until monday morning). One day I was so depressed I even ended up crying in my office "God, what did I do to deserve this? How could I have made such a bad choice?"...
So at the end of the 5th month, which I considered a good moment since it was a round month and I had just completed one of the stages of the nonsense I had been assigned to do and not yet started on the next, I went to deliver my letter of resignation to the new HR manager on the grounds that I was having health issues (both mental and physical), the moron refused to accept it saying that I couldn't do that, so I just walked out of his office and the place. God, I never felt better than that day while I was walking away from that place through the desert until I could reach the highway and take a bus that would get me home! I wasn't singing "Born free" but a song in Spanish with a similar theme as I walked, not following the trails but the shortest, most direct route possible through the desolation. After that, I hired a legal firm to get my resignation letter delivered, no matter how much it cost me (I pity the poor guy who had to go all the way there), together with a certificate by a psychologist indicating how I needed rest (yes, I went to one, explained how I was feeling and couldn't take it any longer). Later I delivered a progress report, then was called to the treasurer's home, I was taken there by my parents as I was still under what you'd call medical leave, talked a bit to her and finally got my payment, and I really don't care if I never get recommendation from them, I got my much needed rest. Some months later I got a casual job with a company that installed telecomm systems for a couple of months, started a business with some friends doing websites (though that failed for reasons I better don't get into) back then when almost noone knew how to do that, and basically, moved on...
EDIT: Oh, crap, and I forgot how they made me PHONE some companies to ask about dielectric materials and then I had to deal with a sales representative who came with some samples and all that in the end was for nothing, as the boss decided we would use whatever we had available on storage...
And the place had a radio-phone which half the time didn't work, and it was also used for the Internet connection which was, what, 64kbps? Or just 16kbps? I think it was the latter... I couldn't even check my e-mail, and browsing the web for information was a nightmare. And when they started to see who they would choose to send to Antarctica, I got chills down my spine at the thought...