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.
Software development. If you could just do what needs to be done without requirements changing every second it would be so much easier.
Luckily there are good project managers to shield you from such nonsense.