The lonliest job in the world

Of all the things that people chose to do with their lives, there are some people who knowingly or inadvertently chose stupid ones. Gynecology comes immediately to mind. I mean there is nothing wrong with being the hands of God and helping bring a new life to this wonderful world but why would you want to subject yourself to blood and flesh all the time? And why would you chose to work for something where you could be called anytime anywhere and as a result, wreck havoc with your personal life? There are more such professions but I am not talking about tough ones right now. I am here to create a list of lonely jobs.

So, I define a lonely job as something where in the process of discharging their duties, people are left to themselves and all they have for company is monotony and their thoughts. The main aur meri tanhai kinds. I know there must be lot of people who like doing such things but then I wish I could peep into their brains and understand what drives them.

Anyways, here is an indicative list of things that I think could qualify for being the lonliest jobs in the world

1. A security guard. Recently at the Auto Expo, I realized that the security guards that we hired for helping us manage the maddening crowds probably had the lonliest job of em all. I mean they are expected to stand for upwards of 12 hours and manage people. It has to be the most monotonous job in the world. Doing the same shit over and over again all the time. And then when you are not managing crowds and just manning a gate for example, you have nothing but the scenery to keep you company. Of course people change, situations change but end of the day, it remains the same.
2. A model standing next to a car in an auto show. The model has to have that regulation, plastic smile on her face all the time. And more than that, she has to stand with her back straight. Worst, she cant engage in any small talk with anyone. She is just expected to stare in the zero and smile and ensure that her back is straight. Ofcourse she is paid a bomb and she gets to chose the guy she wants and all that but come on!
3. The liftman. Ofcourse. All he does in his entire day is press some buttons and solve sudokus and croswords. There are people that he is supposed to greet, salute etc but he must be really lonely. Imagine shutting yourself down in a 3 feet by 3 feet cubicle for an entire day and play with buttons. And he doesnt even have a water cooler that he could visit to engage in office gossip. 
4. The sentry at a remote watchpost. Someone manning a light house. Or someone guarding a royal palace. In fact I have thought of a love story of a royal guard and the princess. The guard has nothing to do but stare at the emptiness and the princess has nothing to do but indulge in vanities. Her best friend happens to be the daughter of the chef at the royal palace. The best friend, because she is a commoner has easier access to the sentry. The princess falls in love with the concept of a lover. And then like all other love stories, there is deciet, lust, emotions, harmones, anger, betrayl etc. Still a concept under development. What do you think of it? 
5. A farmer. A poor farmer who toils the entire day in the field by himself. All he has for company is his crop, the sun and some hopes. The man works so hard that he doesnt even have time to think of things that perplex people like me all the time! 

I think thats about it for the time being. I am sure there are more such professions that I am missing. Do you know of some?