So, looking for rational explanations.
It started a few weeks ago. I started having dreams that my fingers would be covered in some sort of grimey black stuff.
Then, earlier this week, my wife pointed out it looked like I had some sort of oil or grease on my face. Went to the bathroom and looked in the mirror, and sure enough I had grease all over it. I couldn't recall touching anything greasy, though it was sort of weird, but shrugged it off.
Then it happened again. Okay, that was REALLY odd, but maybe I'd just touched the same thing. Meanwhile the grease-dreams have been becoming a bit more disturbing. Not content-wise, just... ambience-wise.
Today, my wife comes home from work to find greasy smudges all across the middle of the kitchen floor. I don't recall any greasy smudges when we left, she confirms. She got home before me - I did leave a bit after her, but I don't THINK I did anything greasy all over the floor... and I'm not greasy when I get to work. But when we get home, the grease is there. And, after the initial discover, she looks at me to find my face is apparently covered in grease again as well.
It's very confusing.
So, grease ghost? I hope its a grease ghost. That would be cool.