It seems that the unrest that now threatens the oil supply from Arab countries is set to hit the world harshly. The oil market was already extremely tense, for fundamental reasons. The fundamental issue is geological, not political. There is simply no longer enough oil to support the continuing expansion of the world economy. As a result, the world oil price has been going up at the astounding rate of a dollar per week, per barrel, for the last five months (graph taken from here):
Exactly as the price is reaching a breaking point for the modern economies, the Arabs start to rage. This is a perfect storm. The Hand of Heaven.