The El Nino Pebble

Unfortunately, the time for this plan has passed, since its success hinges entirely upon the meteorological phenonemnon called "El Nino".

The plan, boiled down to its essential components, is as follows.
I will charter a shrimping barge to transport me to a location in the Pacific Ocean that I have calculated will result in the largest effect.  At this specific coincidence of latitude and longitude, I will drop a pebble, of 1 inch diameter, into the water.  Thanks to the unseasonably strong winds caused by El Nino, the ripples created by this pebble will by amplified and will grow into a tidal wave of mythical porportions.  This wave will hit the island nation of Japan, washing its inhabitants into the sea, and leaving its buildings and cities unoccupied.  I will move in, seize control of the electronics industries and automobile factories, and I will have the world by the throat.

"Well, what if people stop buying Japanese products?"

Stop buying....HAH!  Absurd!  Everything that works is made in Japan!