What is it about the United States Postal workers that makes them so nasty? You know the ones I’m talkin’ ’bout. The ones that work inside the post office behind the desk. Those folks have some serious control issues.
Now that I think about it, anyone who has the “power” to tell you when you can step ahead in a line is on a total power trip. Banks, airport security, stadium ticket takers…they are all full of themselves. If you even think about stepping up before they give you the nod or say, “Next!” they will give you an attitude the size of Texas. What is up with that?
thetightropeblog.com 
I hear ya. I also have a solution, though. Whenever you need something postal-related, drive up to Bradley, S.C. I guarantee you Eva Jane will take care of you with a smile.
i think they must be unhappy with their jobs. i mean how many times can you ask the SAME PERSON if they want to rent a po box before you start to hate yourself?
You can add bouncers to the list.
That is where the term "Going postal" originated. Because they are craaaazy!