Hela is a “throwing disc,” that looks a lot like other “throwing discs” you’ve probably encountered. But the devil (and the delights!) are in the details.
When a couple of Swiss kids on holiday in Hungary found a circular object by a river, they did the logical thing and started playing Frisbee with it. They were gob-smacked to learn, however, that their toy was, in fact, a Soviet anti-tank landmine.