Rogue Waves!!

Rogue Waves which are also known as freak waves, monster waves, killer waves, extreme waves, and abnormal waves,are relatively large and spontaneous ocean surface waves that occur far out in sea, and are a threat even to large ships and ocean liners.  In oceanography, they are more precisely defined as waves whose height is more than twice the significant wave height (SWH).  Rogue waves are not tsunamis, which are set in motion by earthquakes [and] travel at high speed, building up as they approach the shore. Rogue waves seem to occur in deep water or where a number of physical factors such as strong winds and fast currents converge. This may have a focusing effect, which can cause a number of waves to join together.