Walking along the empty street, you realise you're hearing another set of footsteps on top of yours. Slowing down, you glance behind you to see absolutely nothing. No cars. No people. No animals. Nothing. Yet, you still hear the steps picking up your pace, you turn to face the front, only to walk right into the piercing pain of a knife in your chest. That last thing you see is your own face, smiling creepily, right back at you.