Grr. This is one of those things I wish they had when I was a kid. Or maybe they did, but if they did I have never seen one before.
I bought two of these today at the Kaposia Days carnival. It's a potato gun. A little hand held piece of plastic that, when shoved into a potato, removes a small piece of the potato as a projectile and uses air pressure to shoot the "small fry" at whom or whatever you wish. I love it. It's incredibly fun and addicting to use. On the walk home from the carnival I just kept shoving it into the potato and shooting it at the kids. They loved it. It doesn't hurt at all, and it's a lot of fun. All one needs to use the thing is a potato, or other hard vegetable (like carrots, although I haven't tried anything but a potato yet). It probably shoots 20 feet or so. I had the whole potato pretty much done by the time we got home.