We've all had them. What was yours?
Myself, my first job was when I was about 14-15 cleaning up in the morning at a drive in theater. The further back you got, the nastier it got. I carried a stick to pick up the nastier items of feminine hygiene and contraception. After I picked it up, I'd break the end of the stick off so I would not accidentally grab that end of the stick.
Later on, it was at Radio Shack. The district managers managed by terror. I had my job threatened at least once a week. And I did a better than average job. It was hell.
Lastly, as a Bill Collector. This was in the old days when you held your own accounts. At first it seemed terrible, but a few weeks later when all those promised checks didn't come in, you began to get mean. I did some big time lying and trickery trying to find people. I always try to leave the job at work, but back then my wife said at home and away from the job I was going around busting peoples chops and calling them out on little lies, etc... Anyway, after I left and decompressed she said I was a much nicer guy.
Those were so long ago. I still have a fear in the background of having to resort back someday to having a job I hate.