Okay, so I just got back to my room and I noticed there was a weird oily black substance on my hand and all I did was go to the bathroom, come back to my room to get dishes to take to the kitchen. On my way to the kitchen, I accidentally spilled some of the milk that was still left in my cup on the floor so I had to clean that up and then I got a glass of lemonade with ice from the kitchen and that's all I did. So like what was that substance on my hand and like where the hell did it come from?