Assuming that someone is not working illegal or by making easy money (hooker), working as a sales or customer service agent must be stressing. I would get bored taking call after call every minute and either saying the same script or hearing complains.
I don't even liking being on the phone for more than an hour. I can't imagine being on the phone for 8-10 hours answering calls.
Most Helpful Guy
I think I'd find cleaning up crime scenes or accidents the worst. Gory, unpleasant and really upsetting.1
Most Helpful Girl
When they have to stick their hands in a cow's butt. I forgot what it is called.1