Be careful going to the door with a gun in your hand, especially if there is glass in the front door like mine. During super storm Sandy we lost electricity. I have an alarm system which dials a monitoring company that will call police if we don't respond or don't respond with the right code. My alarm system has two back up batteries, one is large and the other is small. The small one controls many of the glass break detectors. Long story short, after a while the small one got weak which tripped the system. I quickly shut it down and assumed since there was no power the system did not dial out. Evidently there was enough power in the battery backup on the VOIP phone line to power the outgoing call to the alarm company. But it must have run out after that because we never got a call back. Went back to sleep and about 10 minutes later there was banging at the front door. My wife tells me to go check, I said no way just ignore it. The banging continues, so she goes to the front door against my advice. It was the cops responding to the call from the alarm company. Glad I did not go to the door with gun in hand, might have gotten ugly.