You were outside of some 24 hour diner at a ripe 1 A.M. There wasn't much interesting. The waitress hadn't come out for 20 minutes, just sitting in the backroom. Neither had the cooks. It was just a place to sit at, at this point. So you did. You smoked a cigarette outside of the place, admiring the winter Chicago scenery. You saw movement, strange movement.
It was fast and sly, and you knew no animal of that calibur could be out here in the middle of the city. You weren't close to a zoo or anything, so that's out of the question.
It couldn't have been a human either, too fast to be one. You just watched, gazing upon the movement from outside the shitty restaurant. Maybe it was an opossum, and you're just overreacting. But you felt eyes on you, and you felt like prey. It was strange, unnerving, and uncanny.