When the ruler of the feast tasted the water now become wine, and didn't know where it came from (but the servants who had drawn the water knew), the ruler of the feast called the bridegroom,

 Let us look at it now from the Greek point of view. It so happens that the Greeks actually possessed stories like this. Dionysos was the Greek god of wine. Pausanias was a Greek who wrote a description of his country and of its ancient ceremonies. In his description of Elis, he describes an old ceremony and belief: "Between the market-place and the Menius is an old theatre and a sanctuary of Dionysos; the image is by Praxiteles. No god is more revered by the Eleans than Dionysos is, and they say that he attends their festival of the Thyia. The place where they hold the festival called the Thyia is about a mile from the city. Three empty kettles are taken into the building and deposited there by the priests in the presence of the citizens and of any strangers who may happen to be staying in the country. On the doors of the buildings the priests, and all who choose to do so, put their seals. Next day they are free to examine the seals, and on entering the building they find the kettles full of wine. I was not there myself at the time of the festival, but the most respectable men of Elis, and strangers too, swore that the facts were as I have said." 