I wonder if he had Jack Johnson&#x27;s pockets behind it...? (they&#x27;re neighbors and long-time boys).<p>It&#x27;s obvious enough that the normal wave pool flapper &#x2F; &quot;pump-and-dump&quot; approach doesn&#x27;t give you a tube.  I always kind of intuitively thought it was wind-related, but reflecting on it that doesn&#x27;t really make sense.  Maybe pushing the water out with some sort of cork-screwing instead of a straight-line push?  Who knows...  anyway, I feel like they may stumbled onto a goldmine.  Awesome indoor winter surfing, anyone?