Typically, post office lines breed anger and frustration. But at the head of this queue on the campus of Penn State University in State College, Pa., you'll find nothing but joy.

"My mission is to make them have a little bit of levity on the way out and say, ‘Hey, it's not so bad after all,'" says Mike Herr.

To that end, Mike lives by a simple motto: if you can't say something nice about someone, you're just not looking hard enough.

Even if it's only how nicely they filled out their forms. And he's been like this with just about every customer, every day, for 38 years.

(WATCH the video from Steve Hartman below, or READ the story from CBS News)