The worst was being a mailman. Long-ass days, little to no material support from the company (bike broken? sux2bu if you don't have a scooter license), and had to walk when it snowed heavily. I quit after they called me and wanted me to do an extra neighbourhood for the same pay. Then I realized how stupid the whole thing was.

Never went back to unskilled labor since then, and I plan to keep it that way.