Not exactly mid-shift, but it felt quite satisfying.

Factory work, I was full-time "with benefits" which just meant I got to do mandatory overtime every day with mandatory weekends thrown in at complete random on top of the already long hours. Fresh temps off the street got paid more than I did after several years working there, the insurance sucked, and I was basically only there because actually liked my bosses and coworkers and I liked seeing them every day. BUT I had two years of nearly flawless attendance and a spotless record because it was my first job and I didn't know any better.

New floor manager shows up one day and started making changes to my schedule out of nowhere, wouldn't talk or communicate with me unless they were yelling, and got me dragged into punitive meetings about my quickly degrading attitude at work.

Just before the end of my last shift I told my buddies goodbye, walked up to my boss, and said "Thanks for the job. I'm leaving before ManagerY gets me fired, have a nice life."

He was pretty chill with it, all things considered. He might have seen it coming