I have a friend who was laid off from his I.T. job. A couple of days later, he got a call from the computer operator, because one of the systems my friend used to manage had died. (To be fair, I'm not sure if the operator was told that Friend had been laid off.) Friend said "The good news is, I'm going to help you - THIS time. The bad news is, if you call me again, my consultant rate starts at $100/hour." He didn't get any more calls.
Kinda related. I worked in IT for about 14 years. One of my employers decided to outsource part of its IT function. Some people were kept in the company while the rest of us became employees of a consultant company. Each IT work group had an in-house team and a consultant team.
I was part of a consultant team that supported IT systems that ran major manufacturing production lines for the company I used to work for. We had a team of four people who had to go on a 24/7 beeper rotation, each taking one week on a rotating basis. That was on top of doing the work we had to do during the day supporting/adding new functionality, etc. I was the senior member of the team with the most experience and knowledge of the systems at that point.
The consultant company wanted to cut its expenses and decided I was no longer needed. So, I got a month's notice but quit a week later after getting another job.
I got a message left on my home answering machine less than two weeks after quitting asking me to come back with a significant raise. Apparently, when I walked out, they started having problems with some of their systems and the rest of the team was struggling to keep up. They found that a team of three could not handle the work of four plus doing all the 24/7 support work needed.
I never returned the call.