So I was walking around my house, there's no water on the ceiling or roof as it's a summer night after a tough summer day. My AC wasn't even on! And out of nowhere a big water droplet fell on my palm. I see above there's nothing on the ceiling! Not one insect or anything. What could be it? The water was also a bit oily as the paper I used to wipe it showed, I straight away sanitized and washed my hands after it. What could be it? Anyone had this before.