Here is some really striking hand-held real time footage of the tsunami that struck Japan a couple years back. This video hadn't been seen by western eyes until recently having been published by Leakedchannel, though I found it here first.
It is about twenty five minutes and I recommend patiently watching all of it. At the beginning it looks like any other stormy day. By the end it looks like THE END.
Incidentally, the power plants that went down during this disaster have apparently been continuously spilling radiated water into the Pacific ever since.