I can relate. Remember the Washington DC area sniper. Well, it was at that time and I was taking my dog out into my own backyard. I opened the door to find a man with a backpack and very long hair right outside my door. He did not look like he belonged. I was convinced that he was the sniper. It turned out that he was a visitor to my next door neighbor who lived off the alley behind me. I screamed. He ran. My neighbor never apologized. I think that it took 5 years off my life.