Several weeks ago, I came across a video online. It was on a site dedicated to dog videos (or possibly general animal videos, with a dog sub-category). The home-shot video was of a machine someone had built to rocket tennis balls down a corridor. The dog, then, was trained to fetch the ball and drop it into the machine, which would trigger to to again launch the ball. The video also showed a small child dropping the balls into the machine for the dog. 've Googled, but have yet to find the site or the video. I realize it may be a long shot, but does anyone know of the site where that video is hosted?