At a small company in 2005 I was hired as the QA manager, I moved across the country for this small startup that had been around for 6 or 7 years. I was told I would get to hire my team of 7 and build the QA team and processes. For 8 months I was the only QA person and was told I couldn't hire anyone. Then suddenly I was asked why I hadn't hired my team yet. So I started interviewing... requirements were 3-5 yrs experience. Interviewed, made offers, nobody was accepting. As the hiring manager, my boss wouldn't let me in on how much the position paid. When I finally found out, I know why nobody was accepting - $30k. I finally convinced him to increase the salary, and I was able to hire two people. Not 7.
When I joined the company, my wife was pregnant with our first child. I talked to my boss, and asked if I could take some vacation days / sick days when the baby came. He said of course, that he had kids, and he totally understood. He was genuinely nice about it and I felt better. My wife had the baby, we had to do an emergency c-section, and everything was fine. That was on a Saturday, and I had planned to take the week after off. On Tuesday, the 2nd day I was off, I got a call from a co-worker saying my boss was flipping out, asking where the hell I was, saying I had to be in the office immediately. I said I couldn't and that my wife needed me as we had no family there. I went in on Thursday, and my boss was a total asshole to me. There was nothing urgent going on at all either, he just wanted me there.
After about a year of putting some kind of QA process with my 2 person team in place at this small company, I was told "You need to automate all of our testing". Then I was told that I could have no budget, couldn't hire any automation people, and had to do it in my spare time without any impacts to other schedules. I explained that it was possible to do, but not with those constraints. I even made some suggestions about how to approach it given those constraints. That wasn't good enough, so I set about busting my ass trying to do it. I was working 60+ hours a week, and making some headway. Two months later a new product manager was hired, and I was told to train him on our product as well. I came in the Monday after a long July4th weekend, and I couldn't log in. Then I was called into the conference room and was fired. I had a bad attitude, and when I was told to do something I should just say "yes". I calmly explained that what they asked me to do wasn't possible, and that's when I found out that the "product manager" I trained was my replacement, and he was going to take my position and do that automation. I said "I guarantee you that he won't".
I kept in touch with friends there. Three months later, the new QA manager was fired. They promoted the first person I hired to manager. She wasn't happy about it. She was fired after a month, followed by the rest of the QA team. Within a year the entire company folded. The promised IPO never happened, the multi-millionaire president-and-founder slunk back to his mansion, and the executives [my boss included] went on to other shady ventures.
I learned a lot there, but it was all mostly how NOT to be a manager.