Though not particularly popular today, this sport was once considered to be ‘the sport of the future’ by many in America. Lack of popularity aside, Jai Alai is a lot more dangerous than you would think at first glance.
The balls, or pelotas, are stupidly hard and can be thrown at incredibly high speeds. In fact, the walls used in the sport have to be made of solid granite, otherwise they damage too easily. Getting hit by one of these things can cause serious injury and even death.