Retail, easy. Like, I enjoy what I do for my job but the people that my store attracts, make it cumbersome. People coming to me all the time with phones in my face of listings to other stores thinking we have them, people impatient, people thinking we have everything and people being deliberately vague but getting pissed when you ask them what they mean.
Graphic designers suffer from similar customer issues as well… or did until the whole AI art thing came along.