I had a job where my supervisor used to cry in the restroom. Sufficient to say that I dropped the thing as soon as possible.
After that I worked in an appliance store for two years. Colleagues where nice and the pay was bellow average, but sometimes you can't be picky.
Unfortunately, I hated dealing with customers as more often than not they only used you as a trash can for their frustrations.
So, after two years, I bid farewell as I enrolled in a two year course to retrain myself as a chemical technician. I've saved up quite a sum and could live for two yeas without a job (with the help of my fiance).
So, I hated my last two jobs for different reasons, but at least they where the force that pushes me to improve and define my boundaries. So, in a sense, I have to thank them.