I come across people in my everyday life, doing certain kinds of jobs who have such a lovely and cheerful demeanor.  The staff in my local Wimpy, supermarket and ethnic grocers are just a few that come to mind.  Happy, chatty, sociable, friendly and probably on minimum wage.  Then there are the others. People in much higher paid jobs who are such complete grouches.  In particular, the ones where they are in contact with the public, I am always left thinking, you clearly don't like people, why on earth do a job where you have to deal with them?