(I expect no sympathy for this answer whatsoever.)
My first job out of college was tutoring for a test prep company. My boss was a batshit insane douchebag with a serious personality disorder. He constantly lied to his employees and students in an attempt to cut corners and save a buck. He expected everyone to work overtime without overtime pay, so I was working a minimum of 60 hours a week while also trying to hold down another part-time job.
He was the top banana in the office so he worked 3 or 4 day weeks (maximum) and called in “sick” with made-up illnesses the rest of the time.
I had never taken a single day off in three years with the company until I woke up with horrible stomach pains and a high fever. A doctor friend told me to go straight to the emergency room. I found a substitute for the class I was supposed to teach that night and let my boss know the situation. He was furious because he thought the substitute would somehow lower the evaluations I got from the class….which determined the size of his end of year bonus.
He told another teacher that if his evaluations were good, said teacher could “blow 4 loads in my mouth”.
Another time, he said (in front of a new teacher I was training), “I’m so busy I haven’t had time to take a shit today!”
So really not the worst job ever, just the worst boss, I guess.