It is a normal evening at home. A night like every other. The kids are playing (and fighting), dinner is cooking, and all is right in the world. There is a knock at the front door. As you rush to see who's there, you are surprised to find an unwanted intruder. There is thief standing there, demanding that you let him in. He is armed and looks pretty dangerous. Being the cautious person that you are, you open the door and invite him in. Hard to believe, right? Who would willingly welcome someone in that was...