The worst part of a web designers job?

It has to be dealing with frustrating clients, the ones that make you so mad you just want to rip all your hair out, the ones that frustrate you so much that you would rather say "Take the work, forget the payment, just leave me alone!" when I get clients like this, it makes me think twice sometimes....

Granted they do come along once in a blue moon, but once is enough for me. I've recently discovered working with family (as a client) is the WORST thing you can do, they expect everything for free and to v.high standards, plus they except multiple revisions as standard....winds me up

I guess it boils down to the actual lack of respect some clients show for their designer.

What do you think is the worst part of a web designers job?