You hear a knocking on the door, and you decide to answer it, assuming it's some kids going around selling poppies for remembrance day. As you open the door, a chill runs down your spine. You pull it open and then a man in a blue jumpsuit, white mask and large kitchen knife stabs you in the gut. You cannot stand up straight, allowing the murderer to steal the briefcase and let you bleed out in pain.
It wanders the woods, before vanishing from the face of the Earth.
He's now in the infinite void of space, on a random ship, with the current passengers unaware of his presence. He kills them swiftly. It's now his ship.