Difficult Jobs - Whats the Most Challenging?

Cleaning at a busy McDonald's. 8hour -11hour shifts on a rotation, sometimes working 10 days straight. Only 30min lunch and on your feet the whole time. Oh and sometimes i'd be working til 2am and at 2am I'd have to ask the manager if the cleaning was to their satisfaction. They would then give you a list of more jobs to do before you could leave. Absolute hell. What's your worst?

I've worked in a supermarket, a local hotel doing a bit of everything and I am now a teacher. Teaching is by far the hardest! I know people slag us off for the amount of holidays we get but I would love to see these people standing in a room full of 30 pupils, each of which have different needs, trying to teach them subject knowledge and skills, whilst dealing with a pupil kicking off and threatening you with violence. I love teaching and working with young people but it is challenging and exhausting and is more difficult now than it was a few years ago.