I think the worst part of being a plumber is fitting in tight spaces, under sinks, with a limited work area. Trying to wrench something loose, that won't come loose, without breaking everything.

Worst of all, while your trying to get the job done, you have some family hovering over you pounding you with mundane questions, while you struggle with some rusted pipe fitting. That just makes the situation even more annoying.

People incorrectly assume that plumbers have real basic and easy jobs. They don't. :)