Ya. I believe in them. [spoiler]One time when I was out at a mini-golf course, I was just standing there watching my friends and I felt something punch me in the stomach. I actually bent over a little (high pain tolerance) and put my fists up in the direction that it came from. There was no one there. I also felt really cold when it hit me. Best way I can describe the hit was an ice block slamming into your stomach.[/spoiler]