How exciting can a giant inflatable ball be to a full-grown adult? Well if you've ever been to an outdoor concert, or even a rave you'll know that people love bouncing around inflatable balls. I'm ...

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Sure, you've played "keep it up" with big rubber ball or half-helium balloon at a rave or concert before, but you've probably never had the pleasure of smacking around a one-and-a-half-meter sphere ...