Street sweeper in Brighton is definitely up there on the list. Many years ago now.
It was a job generally worked by forgotten and demoralised people. It was quite bleak doing the early shift, a lot of the guys would start drinking at 5/6 in the morning and drag it out into the day. There were also plenty of members of the public who were pretty keen on making the job significantly harder than it had to be.
I was lucky, inasmuch as I was young and robust, and really just passing through on a bit of agency work. But, I felt sorry for the guys who were there long term. It was bleak.
It was however, a good lesson for me as a young man in what can happen in life if you're not careful. How you can just 'end up' somewhere and how easily life can get the better of you. I was grateful for that.