Grab phone and call 911 while heading out the back door/window if possible. If I have no exit then I hole up with the family in the safest room possible. If he wants to break down multiple doors because he is too drunk to realize he is lost then he just might get shot. In reality if he is that drunk it probably wont be necessary to shoot him. Simple takedown manuever or a frying pan upside the head would be enough.
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