National Common Courtesy Day

The other day I was in Big Sky, going into the mall.  I had one kid on my hip, and an armful of equipment.  The man in front of me held the door for his family, looked at me, and went inside.  The door closed on my arm, and I almost dropped Matthew.

I am assuming he wasn't from here, because no Montana man I know would do that.

Today is National Common Courtesy Day, which I think should be every day.  Please, thank you, and a smile go a long way!

What is your biggest common courtesy pet-peeve?