Two more points:
1. Who should thank whom after payment is made at the grocery store? Cashiers seem to think they are doing us a favor by chewing gum and failing to either look us in the eye out acknowledge that they owe their paychecks to us.
2. When leaving a message on voice mail or answering machine, give the listener a heads up that a phone number is coming. I sometimes listen to two minute messages when a phone number is suddenly blurted out so fast that I can't tell the numbers. So I have to listen to the whole thing over, hoping that I'll understand it the second time. Here's a hint: If you want me to return your call, make it easier by slowly and clearly pronouncing the numbers. Also, don't cram five minutes of a message into a one-minute voice mail.