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I actually thought about that, but through an odd set of circumstances, I had no car out. My brother borrowed my truck and my wife's car was gone. I think he was tapping on the door because there were no cars at the house. Now he will think a crazy shut-in lives there with no car...at least that is what I am hoping. (Unfortunately I will not be able to realize my dream of being a crazy shut-in until I retire).

Always answer the door armed. I am afraid not to answer the door as we have a problem with break-in crooks knocking on doors to see if anyone is home in my neighborhood.
A few Saturday's ago I was at home about 11am. I hear a really soft tap on the door. A few seconds later I hear it again and can see a cholo guy at the door. I pick up my shotgun and open the main door, leaving the metal security door closed. When I open the door, he seems startled, but can't see me because of the security door. I tell him hello and ask what I can do for him. He stumbles a little and asks for a drink of water.
I tell him hold on. I go to the back of the house and come out through the side door and walk around front, with shotgun in hand. When he sees me come around the side, he get super nervous and tells me "huh, that is cool, never mind".
I ask him "do you want some water or not?" He responds "huh, sure". I go turn on the hose, and he picks it up and takes a drink. He tells me, "I'm not from around here. People in this town are kind of jumpy." I tell him, "really, I hadn't noticed". He thanks me a takes off down the street. I just stand there and watch him as he heads on down the road. He looks back three or four times and sees me watching him leave.
I guess he could have been a random guy who wanted a drink of water, but my guess is he was checking for empty homes. I don't think he is coming back. I remember the old story about how the stranger asking for help may be an angel in disguise, so in case he was an angel, I gave him some water, and in case he wasn't, I could have given him some 00 buck.