Hell if I know. They always do in the TV shows. I deal more with freaky shit in the real world. Monsters don't usually take a lot of time with things and if they do it's dictated by shit like the full moon and rituals. If I were home, I'd say it's a demon or...hell a vengeful spirit with a hard on for Shakespeare. Here, it's probably some human asshole that wants to see us run around in circles.