Californian David Potts bobs up once, vanishes
                                
                                
                                    (Newser) -
                                    Horrified onlookers watched helplessly as a Northern California man was sucked into a tourist-touted "blowhole" on the shores of Maui. David Potts was clowning around close to the geyser-like phenomenon when a sneaker wave knocked him off his feet and he disappeared down the spouting hole. He bobbed to...