I told this one a while ago in a similar thread.
About 11 years ago I came home late one night to our fairly remote acreage and saw a strange car in the driveway. Didn't think much of it, thought someone stopped by to see my Wife. I got out of car and walked along the North (back) side of the house, which was lighted. In my right hand I had my keys. In my left I had an 8 1/2x11" notebook and propped behind that I had my M696 S&W revolver. The way it was positioned the muzzle was pointing to my left and sticking out a few inches. I had not planned it that way, but the muzzle would be visible to anyone in front of me.
As I walked along the back of the house, suddenly a man I had never seen before stepped out from the East side of the house. That side is not lighted, there are no doors there, and there was about a foot of snow on the ground, and it was not shoveled over there. I immediately stopped and said "Hi". He said "Hi" and continued walking towards me with a very disturbing smirk on his face and his hands in the pockets of his coveralls. He continued advancing towards me until he got about 20' away, and suddenly stopped cold in his tracks, the smirk vanishing from his face. The reason? He could now see that Stainless .44 Spl muzzle. The revolver was not in my hand, mind you, still in the crook of my arm pointing to my left.
I said "What are you doing?" He nervously replied he was "Looking for a friend and rang the doorbell and nobody answered". I said "Who is your friend?" he replied "I'd rather not say". At that point I suggested he might want to leave, and he readily walked to his car. He opened the door, stood there and asked "Do you always get home this late?" Now, if he's just looking for a friend, why should he care? I once again suggested he leave, and he did.
I went inside and my Wife was still up. When I related this story she told me nobody had rang the doorbell. I took my flashlight and looked at his footprints in the snow on the East side of the house. They went right up to the window. My Wife and three young children were all home. I shudder to think what would have happened had I and my two friends Smith and Wesson not come home when we did.
I called the Police to report it, telling them I was armed at the time, and they made no comment.

Did the presence of my S&W save my life that night? I really can't say. All I know is this stranger, who was bigger than me, with his hands in his pockets and a very disturbing look on his face had a "Sudden and acute failure of the victim selection process" when he caught sight of that muzzle.
That, my friends, is a happy ending.

Jim