This wasn't terribly crazy but one winter the sidewalk froze up in front of my house and we used it as a skating rink. I don't recall if we added extra water to it to get it to freeze or not, but we would spend hours sliding across it on our sneakers or boots. I'm surprised my parents didn't object to it since it was such a hazard. We could not step on it without slipping. One time a lady came by in heels ( a real sourpuss librarian) We were expecting her to fall, but she just walked over the ice like it was nothing.