And don't think it's because I'm paranoid or anything...it's more a case of what's good manners. It's just not good manners in my opinion, to drop by someone's house that you don't know. And it's sure not good behavior for my kids to be running around when I open the front door, distracting me from what I am dealing with at the door!
I have actually had salemen come to my door during the day and see me looking out the window at them. They shout through the door "Can I speak with you?" to which I respond "No."
(grin)