I'd say I'm lucky. I've never had a job I would call even "bad", certainly nothing close to "terrible".
So the worst one would be that two-years job when a woman my mother knew wanted someone she could trust to be her accountant. Mom volunteered me and as it payed more then the job I had, I agreed.
Let it be known that at that point I had absolutely no knowledge in that field. Only what her former accountant told me, my mother's help and some internet sources. And to top it all, while I'm good with numbers, the moment I start think them as money I... fail. Completely. As in "add three numbers three times in different order and get three different results". So I had to check and re-check everything.
I've finally went to and finished 3-weeks accounting courses... four months before quitting.