Wow! Good Thread.
I will say though one day I was at a customer. Doors were closed, bell on the side. I rang while looking through the glass to see that they were milling around inside. So after the bell rang, and the D-bag inside didn't come to the door, I rang again. Then the phone rang. He went for the phone! Don't cha know I started going off! Not one of my best moments but the friend bomb was dropping left and right. I was pi88ed! While in my little tirade, this guy comes up on a bike and asks my why I was going off on the guys inside with the doors closed. I told him that they were not answering the door when I was there before the phone rang. Turns out that when they did answer, this guy on the bike chewed them a new A88hole, as he was their boss. I haven't had a problem since.