You awaken with a knife in your hand...

You awaken disoriented, with a knife in your hand. You are covered in blood. You find yourself in a strange place you don’t recognize, and before you, on the bed, is the body of a person you don’t know, slashed to ribbons, and very, very dead. From the horrified look on the corpse’s face and the defensive slashes on both arms, the person did not go gently into the night.

You have no memory of how you got here. You seem to be unharmed. Other than you and the corpse, there is no one around. For the time being, you are alone.

What do you do?

(For those of you who will claim that you’ll call the police and sit quietly until they arrive, remember that something like this ruins lives—not only your life, but the lives of your friends and family. You could easily clean up and creep away and, after all, you have no memory of the event.)