If you like watching people being frightened, this is the video for you. A man and his cameraman friend set up shop in an alleyway near Chicago's DePaul University. The guy was dressed up like Slender Man, a creepy faceless man/internet meme. His friend was recording from a nearby rooftop. All they had to do was wait for people to walk by. And they did. And it was funny. (And creepy.)