Here's a story that ties in perfectly with the fact that Miss Manners (Judith Martin) was born on this date; September 13, 1938.

According to a recent study by the Public Agenda Research Group, most Americans (79%) believe that Americans have gotten ruder over the past ten years.

Most cite maniac driving, cell phone yapping and immature kids as the biggest rudeness trends.

If, by chance, you should be guilty of one of those "bad habits," Miss Manners says if you want to replace a bad habit with a good one, you have got to do the good one at least 21 times.

Why does it work?  Studies in human behavior reveal that it takes 21 times to "permanently reroute your brain" so that it recognizes the good habit over the bad one.

What do you think?  What's the rudest thing you've ever experienced?