I’m not asking about the worst job. I’m asking about the grimmest one. For me it was when in my teenage years I was making candles you would put on a grave. Most of the time is was just filling the form, burn the right shape and passing it forward. But sometimes I had to fill in for a person who was selling these things, and that is where it gets grim. It was decades ago but I still remember one lady who asked what would be the best candle to memorialize her late husband. And she gave me the whole life story of her and her husband. I shit you not, it was the most touching love story I have ever heard. I quit the next day.
There’s a great German TV show from a few years back about a crime scene cleaner “Tatortreiniger”. It’s more philosophical/funny than gruesome and worth a watch if you don’t mind reading sub-titles. The BBC did an adaptation in English, but I’ve not watched it yet.