I've had some tough jobs but what has made any job even a good one bad has been management. So, I will just stick with tough jobs and not consider bad supervision. I did a few months as a migrant worker picking a variety of crops. Green onions, green beans, radishes, and cucumbers to name a few. All day long in hot humid weather for very low pay. I really didn't need the money, I just wanted to try out the job. I made enough for a pizza on the weekends.
Picking green onions, the smell stays on your hands for days! It matters not how much you wash your hands. The actual migrants, usually traveling from Texas to the north looking for fields and orchards to work hated me. They would come with their families and all that could work, would work for the good of the family. I was just a local kid working next to them.
When I got older and able to work at the steel mills I worked as a casting man, pouring iron at 2300°F for ingot molds.
One time I saved a life but on two separate occasions I ended up in the hospital myself. But the compensation was big. I made a good amount of money.
After the ingot mold was poured and cooled, I would crawl in and clean them cutting the iron by hand with a chipping gun and grinding it as smooth as glass with large handheld grinders. This is a photo of one of the small molds, I would say this weighted about 5-10 tons, but I would crawl in molds that weight up to 40 tons. I had to wear fresh air equipment including a respirator all day long. The bottleneck molds were like working in a very tight cave laying on your back and stomach with enough room just to rollover.