When I was a kid, my parents went out one night and left me home alone. We had a bunch of cats, and we fed them all in separate rooms with the doors closed to keep them from stealing each other's food. My parents had fed them, I only had to let them out. I went to the back of the house to let out Playful, who ate in the room directly across the hall from my bedroom. When I opened the door, there was blood everywhere. His food dish was about a quarter filled with it, and there were bloody pawprints on the floor near the door... but not a speck in on my cat. I checked his paws and his mouth, there was no blood on him at all. When my parents came home they checked him over and weren't able to find any explanation either.